Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:984:1 (inst/NEWS.Rd:618): Warning: missing </ul> before </div>
NEWS.html:61:1 (inst/NEWS.Rd:33): Warning: <h4> anchor "Misc" already defined
NEWS.html:93:1 (inst/NEWS.Rd:56): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:105:1 (inst/NEWS.Rd:62): Warning: <h4> anchor "Misc" already defined
NEWS.html:138:1 (inst/NEWS.Rd:80): Warning: <h4> anchor "Misc" already defined
NEWS.html:163:1 (inst/NEWS.Rd:92): Warning: <h4> anchor "New-Features" already defined
NEWS.html:175:1 (inst/NEWS.Rd:98): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:204:1 (inst/NEWS.Rd:118): Warning: <h4> anchor "New-Features" already defined
NEWS.html:243:1 (inst/NEWS.Rd:137): Warning: <h4> anchor "New-Features" already defined
NEWS.html:260:1 (inst/NEWS.Rd:147): Warning: <h4> anchor "New-Features" already defined
NEWS.html:291:1 (inst/NEWS.Rd:168): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:308:1 (inst/NEWS.Rd:178): Warning: <h4> anchor "Tweaks" already defined
NEWS.html:323:1 (inst/NEWS.Rd:186): Warning: <h4> anchor "Tweaks" already defined
NEWS.html:339:1 (inst/NEWS.Rd:195): Warning: <h4> anchor "New-Features" already defined
NEWS.html:355:1 (inst/NEWS.Rd:204): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:370:1 (inst/NEWS.Rd:212): Warning: <h4> anchor "New-Features" already defined
NEWS.html:388:1 (inst/NEWS.Rd:223): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:405:1 (inst/NEWS.Rd:233): Warning: <h4> anchor "New-Features" already defined
NEWS.html:419:1 (inst/NEWS.Rd:241): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:435:1 (inst/NEWS.Rd:250): Warning: <h4> anchor "New-Features" already defined
NEWS.html:461:1 (inst/NEWS.Rd:268): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:484:1 (inst/NEWS.Rd:283): Warning: <h4> anchor "New-Features" already defined
NEWS.html:498:1 (inst/NEWS.Rd:291): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:520:1 (inst/NEWS.Rd:305): Warning: <h4> anchor "New-Features" already defined
NEWS.html:532:1 (inst/NEWS.Rd:311): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:548:1 (inst/NEWS.Rd:320): Warning: <h4> anchor "New-Features" already defined
NEWS.html:565:1 (inst/NEWS.Rd:327): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:584:1 (inst/NEWS.Rd:337): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:599:1 (inst/NEWS.Rd:345): Warning: <h4> anchor "New-Features" already defined
NEWS.html:619:1 (inst/NEWS.Rd:355): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:635:1 (inst/NEWS.Rd:364): Warning: <h4> anchor "New-Features" already defined
NEWS.html:654:1 (inst/NEWS.Rd:373): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:670:1 (inst/NEWS.Rd:382): Warning: <h4> anchor "New-Features" already defined
NEWS.html:689:1 (inst/NEWS.Rd:392): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:704:1 (inst/NEWS.Rd:400): Warning: <h4> anchor "New-Features" already defined
NEWS.html:726:1 (inst/NEWS.Rd:422): Warning: <h4> anchor "Tweaks" already defined
NEWS.html:741:1 (inst/NEWS.Rd:430): Warning: <h4> anchor "New-Features" already defined
NEWS.html:752:1 (inst/NEWS.Rd:435): Warning: <h4> anchor "Misc" already defined
NEWS.html:770:1 (inst/NEWS.Rd:445): Warning: <h4> anchor "New-Features" already defined
NEWS.html:793:1 (inst/NEWS.Rd:457): Warning: <h4> anchor "New-Features" already defined
NEWS.html:807:1 (inst/NEWS.Rd:463): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:823:1 (inst/NEWS.Rd:472): Warning: <h4> anchor "New-Features" already defined
NEWS.html:840:1 (inst/NEWS.Rd:481): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:970:1 (inst/NEWS.Rd:614): Warning: <h4> anchor "New-Features" already defined