Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:3642:1 (inst/NEWS.Rd:1471): Warning: missing </ul> before </div>
NEWS.html:118:1 (inst/NEWS.Rd:48): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:141:1 (inst/NEWS.Rd:57): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:167:1 (inst/NEWS.Rd:67): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:196:1 (inst/NEWS.Rd:78): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:212:1 (inst/NEWS.Rd:85): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:232:1 (inst/NEWS.Rd:93): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:260:1 (inst/NEWS.Rd:104): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:286:1 (inst/NEWS.Rd:114): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:309:1 (inst/NEWS.Rd:123): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:325:1 (inst/NEWS.Rd:130): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:381:1 (inst/NEWS.Rd:153): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:398:1 (inst/NEWS.Rd:160): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:409:1 (inst/NEWS.Rd:165): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:429:1 (inst/NEWS.Rd:173): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:445:1 (inst/NEWS.Rd:180): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:498:1 (inst/NEWS.Rd:199): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:512:1 (inst/NEWS.Rd:205): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:538:1 (inst/NEWS.Rd:217): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:554:1 (inst/NEWS.Rd:224): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:574:1 (inst/NEWS.Rd:232): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:585:1 (inst/NEWS.Rd:237): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:610:1 (inst/NEWS.Rd:247): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:630:1 (inst/NEWS.Rd:255): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:641:1 (inst/NEWS.Rd:260): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:657:1 (inst/NEWS.Rd:267): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:680:1 (inst/NEWS.Rd:276): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:697:1 (inst/NEWS.Rd:283): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:722:1 (inst/NEWS.Rd:293): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:756:1 (inst/NEWS.Rd:307): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:773:1 (inst/NEWS.Rd:314): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:798:1 (inst/NEWS.Rd:324): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:821:1 (inst/NEWS.Rd:333): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:835:1 (inst/NEWS.Rd:339): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:868:1 (inst/NEWS.Rd:353): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:879:1 (inst/NEWS.Rd:358): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:895:1 (inst/NEWS.Rd:365): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:918:1 (inst/NEWS.Rd:374): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:935:1 (inst/NEWS.Rd:381): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:968:1 (inst/NEWS.Rd:395): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:988:1 (inst/NEWS.Rd:403): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1005:1 (inst/NEWS.Rd:410): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1028:1 (inst/NEWS.Rd:419): Warning: <h4> anchor "DOCUMENTATION" already defined
NEWS.html:1047:1 (inst/NEWS.Rd:427): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1064:1 (inst/NEWS.Rd:434): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1075:1 (inst/NEWS.Rd:439): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1091:1 (inst/NEWS.Rd:446): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1113:1 (inst/NEWS.Rd:456): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:1129:1 (inst/NEWS.Rd:463): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1155:1 (inst/NEWS.Rd:473): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1172:1 (inst/NEWS.Rd:480): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1197:1 (inst/NEWS.Rd:490): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1220:1 (inst/NEWS.Rd:499): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1231:1 (inst/NEWS.Rd:504): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1249:1 (inst/NEWS.Rd:512): Warning: <h4> anchor "DOCUMENTATION" already defined
NEWS.html:1265:1 (inst/NEWS.Rd:519): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1288:1 (inst/NEWS.Rd:528): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1305:1 (inst/NEWS.Rd:535): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:1321:1 (inst/NEWS.Rd:542): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1341:1 (inst/NEWS.Rd:550): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1361:1 (inst/NEWS.Rd:558): Warning: <h4> anchor "DOCUMENTATION" already defined
NEWS.html:1377:1 (inst/NEWS.Rd:565): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1397:1 (inst/NEWS.Rd:573): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1417:1 (inst/NEWS.Rd:581): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1442:1 (inst/NEWS.Rd:591): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1453:1 (inst/NEWS.Rd:596): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1470:1 (inst/NEWS.Rd:603): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1486:1 (inst/NEWS.Rd:610): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1518:1 (inst/NEWS.Rd:622): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1541:1 (inst/NEWS.Rd:631): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1607:1 (inst/NEWS.Rd:656): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1627:1 (inst/NEWS.Rd:664): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1638:1 (inst/NEWS.Rd:669): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1657:1 (inst/NEWS.Rd:677): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1686:1 (inst/NEWS.Rd:688): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1697:1 (inst/NEWS.Rd:693): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1726:1 (inst/NEWS.Rd:704): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:1742:1 (inst/NEWS.Rd:711): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1777:1 (inst/NEWS.Rd:724): Warning: <h4> anchor "DEPENDENCIES" already defined
NEWS.html:1791:1 (inst/NEWS.Rd:730): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:1805:1 (inst/NEWS.Rd:736): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1843:1 (inst/NEWS.Rd:750): Warning: <h4> anchor "DOCUMENTATION" already defined
NEWS.html:1862:1 (inst/NEWS.Rd:758): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1896:1 (inst/NEWS.Rd:772): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1920:1 (inst/NEWS.Rd:782): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:1931:1 (inst/NEWS.Rd:787): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1948:1 (inst/NEWS.Rd:794): Warning: <h4> anchor "NEW-DEPENDENCIES" already defined
NEWS.html:2046:1 (inst/NEWS.Rd:834): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2066:1 (inst/NEWS.Rd:842): Warning: <h4> anchor "NEW-DEPENDENCIES" already defined
NEWS.html:2083:1 (inst/NEWS.Rd:849): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2104:1 (inst/NEWS.Rd:858): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2121:1 (inst/NEWS.Rd:865): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2156:1 (inst/NEWS.Rd:880): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2200:1 (inst/NEWS.Rd:896): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2211:1 (inst/NEWS.Rd:901): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2237:1 (inst/NEWS.Rd:911): Warning: <h4> anchor "SUBSTANTIAL-CHANGES-TO-DOCUMENTATION" already defined
NEWS.html:2253:1 (inst/NEWS.Rd:918): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2264:1 (inst/NEWS.Rd:923): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2280:1 (inst/NEWS.Rd:930): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2312:1 (inst/NEWS.Rd:942): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2332:1 (inst/NEWS.Rd:950): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2366:1 (inst/NEWS.Rd:963): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2395:1 (inst/NEWS.Rd:974): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2426:1 (inst/NEWS.Rd:986): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2494:1 (inst/NEWS.Rd:1010): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2528:1 (inst/NEWS.Rd:1024): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2564:1 (inst/NEWS.Rd:1038): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2587:1 (inst/NEWS.Rd:1047): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2611:1 (inst/NEWS.Rd:1057): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2625:1 (inst/NEWS.Rd:1063): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2649:1 (inst/NEWS.Rd:1073): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2681:1 (inst/NEWS.Rd:1085): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2698:1 (inst/NEWS.Rd:1092): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2724:1 (inst/NEWS.Rd:1102): Warning: <h4> anchor "SUBSTANTIAL-CHANGES-TO-DOCUMENTATION" already defined
NEWS.html:2756:1 (inst/NEWS.Rd:1116): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2795:1 (inst/NEWS.Rd:1131): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2821:1 (inst/NEWS.Rd:1141): Warning: <h4> anchor "FIXED-BUGS" already defined
NEWS.html:2835:1 (inst/NEWS.Rd:1147): Warning: <h4> anchor "SUBSTANTIAL-CHANGES-TO-DOCUMENTATION" already defined
NEWS.html:2858:1 (inst/NEWS.Rd:1156): Warning: <h4> anchor "OTHER-CHANGES" already defined
NEWS.html:2876:1 (inst/NEWS.Rd:1164): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2901:1 (inst/NEWS.Rd:1174): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:2939:1 (inst/NEWS.Rd:1190): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2950:1 (inst/NEWS.Rd:1195): Warning: <h4> anchor "CORRECTED-BUGS" already defined
NEWS.html:2968:1 (inst/NEWS.Rd:1203): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3009:1 (inst/NEWS.Rd:1219): Warning: <h4> anchor "CORRECTED-BUGS" already defined
NEWS.html:3039:1 (inst/NEWS.Rd:1231): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3077:1 (inst/NEWS.Rd:1245): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3145:1 (inst/NEWS.Rd:1271): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3186:1 (inst/NEWS.Rd:1286): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3206:1 (inst/NEWS.Rd:1294): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3227:1 (inst/NEWS.Rd:1303): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3247:1 (inst/NEWS.Rd:1311): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3274:1 (inst/NEWS.Rd:1323): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3309:1 (inst/NEWS.Rd:1336): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3320:1 (inst/NEWS.Rd:1341): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3338:1 (inst/NEWS.Rd:1349): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3370:1 (inst/NEWS.Rd:1363): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3396:1 (inst/NEWS.Rd:1373): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3426:1 (inst/NEWS.Rd:1385): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3440:1 (inst/NEWS.Rd:1391): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3460:1 (inst/NEWS.Rd:1399): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3481:1 (inst/NEWS.Rd:1408): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3522:1 (inst/NEWS.Rd:1423): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3543:1 (inst/NEWS.Rd:1432): Warning: <h4> anchor "BUGS" already defined
NEWS.html:3570:1 (inst/NEWS.Rd:1444): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3596:1 (inst/NEWS.Rd:1457): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3610:1 (inst/NEWS.Rd:1463): Warning: <h4> anchor "USER-LEVEL-CHANGES" already defined
NEWS.html:3629:1 (inst/NEWS.Rd:1469): Warning: <h4> anchor "BUG-FIXES" already defined