Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:1026:1 (inst/NEWS.Rd:651): Warning: missing </ul> before </div>
NEWS.html:79:1 (inst/NEWS.Rd:43): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:124:1 (inst/NEWS.Rd:79): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:165:1 (inst/NEWS.Rd:103): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:245:1 (inst/NEWS.Rd:165): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:282:1 (inst/NEWS.Rd:186): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:302:1 (inst/NEWS.Rd:198): Warning: <h4> anchor "Misc" already defined
NEWS.html:320:1 (inst/NEWS.Rd:207): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:331:1 (inst/NEWS.Rd:212): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:342:1 (inst/NEWS.Rd:217): Warning: <h4> anchor "Misc" already defined
NEWS.html:367:1 (inst/NEWS.Rd:233): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:380:1 (inst/NEWS.Rd:240): Warning: <h4> anchor "Misc" already defined
NEWS.html:396:1 (inst/NEWS.Rd:249): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:417:1 (inst/NEWS.Rd:258): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:429:1 (inst/NEWS.Rd:264): Warning: <h4> anchor "Misc" already defined
NEWS.html:457:1 (inst/NEWS.Rd:282): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:509:1 (inst/NEWS.Rd:319): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:548:1 (inst/NEWS.Rd:347): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:562:1 (inst/NEWS.Rd:353): Warning: <h4> anchor "Misc" already defined
NEWS.html:582:1 (inst/NEWS.Rd:365): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:599:1 (inst/NEWS.Rd:376): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:626:1 (inst/NEWS.Rd:393): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:658:1 (inst/NEWS.Rd:416): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:692:1 (inst/NEWS.Rd:438): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:715:1 (inst/NEWS.Rd:449): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:735:1 (inst/NEWS.Rd:460): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:805:1 (inst/NEWS.Rd:516): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:841:1 (inst/NEWS.Rd:537): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:862:1 (inst/NEWS.Rd:550): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:878:1 (inst/NEWS.Rd:559): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:894:1 (inst/NEWS.Rd:568): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:910:1 (inst/NEWS.Rd:577): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:935:1 (inst/NEWS.Rd:594): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:989:1 (inst/NEWS.Rd:632): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1011:1 (inst/NEWS.Rd:646): Warning: <h4> anchor "NEW-FEATURES" already defined