Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:66:1 (inst/NEWS.Rd:24): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:116:1 (inst/NEWS.Rd:45): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:139:1 (inst/NEWS.Rd:54): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:157:1 (inst/NEWS.Rd:63): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:184:1 (inst/NEWS.Rd:75): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:198:1 (inst/NEWS.Rd:81): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:219:1 (inst/NEWS.Rd:91): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:242:1 (inst/NEWS.Rd:100): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:257:1 (inst/NEWS.Rd:108): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:271:1 (inst/NEWS.Rd:114): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:295:1 (inst/NEWS.Rd:124): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:318:1 (inst/NEWS.Rd:133): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:350:1 (inst/NEWS.Rd:148): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:387:1 (inst/NEWS.Rd:163): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:408:1 (inst/NEWS.Rd:173): Warning: <h4> anchor "DATA-UPDATES" already defined
NEWS.html:422:1 (inst/NEWS.Rd:179): Warning: <h4> anchor "STATISTICS" already defined
NEWS.html:457:1 (inst/NEWS.Rd:192): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:492:1 (inst/NEWS.Rd:208): Warning: <h4> anchor "DATA-UPDATES" already defined
NEWS.html:521:1 (inst/NEWS.Rd:219): Warning: <h4> anchor "STATISTICS" already defined
NEWS.html:575:1 (inst/NEWS.Rd:241): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:599:1 (inst/NEWS.Rd:251): Warning: <h4> anchor "DATA-UPDATES" already defined
NEWS.html:637:1 (inst/NEWS.Rd:266): Warning: <h4> anchor "STATISTICS" already defined
NEWS.html:657:1 (inst/NEWS.Rd:274): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:686:1 (inst/NEWS.Rd:285): Warning: <h4> anchor "TECHNICAL" already defined
NEWS.html:703:1 (inst/NEWS.Rd:292): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:735:1 (inst/NEWS.Rd:307): Warning: <h4> anchor "DATA-UPDATES" already defined
NEWS.html:755:1 (inst/NEWS.Rd:315): Warning: <h4> anchor "TECHNICAL" already defined
NEWS.html:778:1 (inst/NEWS.Rd:324): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:799:1 (inst/NEWS.Rd:334): Warning: <h4> anchor "NEW-DATA" already defined
NEWS.html:819:1 (inst/NEWS.Rd:342): Warning: <h4> anchor "DATA-UPDATES" already defined
NEWS.html:839:1 (inst/NEWS.Rd:350): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:881:1 (inst/NEWS.Rd:367): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:904:1 (inst/NEWS.Rd:376): Warning: <h4> anchor "NEW-DATA" already defined
NEWS.html:919:1 (inst/NEWS.Rd:384): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:960:1 (inst/NEWS.Rd:399): Warning: <h4> anchor "NEW-DATA" already defined
NEWS.html:991:1 (inst/NEWS.Rd:412): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:1029:1 (inst/NEWS.Rd:426): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1047:1 (inst/NEWS.Rd:435): Warning: <h4> anchor "NEW-DATA" already defined
NEWS.html:1070:1 (inst/NEWS.Rd:448): Warning: <h4> anchor "NEW-STATISTICS" already defined
NEWS.html:1091:1 (inst/NEWS.Rd:457): Warning: <h4> anchor "UPDATES" already defined
NEWS.html:1164:1 (inst/NEWS.Rd:488): Warning: <h4> anchor "BUG-FIXES" already defined