Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:1017:1 (inst/NEWS.Rd:566): Warning: missing </ul> before </div>
NEWS.html:75:1 (inst/NEWS.Rd:37): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:103:1 (inst/NEWS.Rd:54): Warning: <h4> anchor "New-function" already defined
NEWS.html:117:1 (inst/NEWS.Rd:62): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:159:1 (inst/NEWS.Rd:86): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:171:1 (inst/NEWS.Rd:92): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:211:1 (inst/NEWS.Rd:115): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:223:1 (inst/NEWS.Rd:122): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:271:1 (inst/NEWS.Rd:149): Warning: <h4> anchor "Misc." already defined
NEWS.html:287:1 (inst/NEWS.Rd:159): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:315:1 (inst/NEWS.Rd:174): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:331:1 (inst/NEWS.Rd:184): Warning: <h4> anchor "New-functions" already defined
NEWS.html:357:1 (inst/NEWS.Rd:200): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:374:1 (inst/NEWS.Rd:210): Warning: <h4> anchor "New-functions" already defined
NEWS.html:395:1 (inst/NEWS.Rd:222): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:411:1 (inst/NEWS.Rd:230): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:427:1 (inst/NEWS.Rd:240): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:444:1 (inst/NEWS.Rd:249): Warning: <h4> anchor "Misc." already defined
NEWS.html:460:1 (inst/NEWS.Rd:258): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:476:1 (inst/NEWS.Rd:267): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:492:1 (inst/NEWS.Rd:277): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:519:1 (inst/NEWS.Rd:293): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:545:1 (inst/NEWS.Rd:310): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:571:1 (inst/NEWS.Rd:327): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:599:1 (inst/NEWS.Rd:345): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:619:1 (inst/NEWS.Rd:355): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:647:1 (inst/NEWS.Rd:370): Warning: <h4> anchor "New-functions" already defined
NEWS.html:681:1 (inst/NEWS.Rd:391): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:698:1 (inst/NEWS.Rd:401): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:710:1 (inst/NEWS.Rd:408): Warning: <h4> anchor "Misc" already defined
NEWS.html:726:1 (inst/NEWS.Rd:419): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:743:1 (inst/NEWS.Rd:429): Warning: <h4> anchor "Misc" already defined
NEWS.html:795:1 (inst/NEWS.Rd:460): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:807:1 (inst/NEWS.Rd:466): Warning: <h4> anchor "Misc" already defined
NEWS.html:831:1 (inst/NEWS.Rd:479): Warning: <h4> anchor "Misc" already defined
NEWS.html:848:1 (inst/NEWS.Rd:487): Warning: <h4> anchor "New-functions" already defined
NEWS.html:864:1 (inst/NEWS.Rd:496): Warning: <h4> anchor "New-functions" already defined
NEWS.html:875:1 (inst/NEWS.Rd:501): Warning: <h4> anchor "Misc" already defined
NEWS.html:893:1 (inst/NEWS.Rd:509): Warning: <h4> anchor "New-functions" already defined
NEWS.html:903:1 (inst/NEWS.Rd:513): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:943:1 (inst/NEWS.Rd:532): Warning: <h4> anchor "Bug-Fixes" already defined
NEWS.html:962:1 (inst/NEWS.Rd:541): Warning: <h4> anchor "General" already defined
NEWS.html:973:1 (inst/NEWS.Rd:546): Warning: <h4> anchor "Changes-in-existing-functions" already defined
NEWS.html:1000:1 (inst/NEWS.Rd:561): Warning: <h4> anchor "Bug-Fixes" already defined