Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:49:1 (inst/NEWS.Rd:19): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:64:1 (inst/NEWS.Rd:28): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:79:1 (inst/NEWS.Rd:36): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:94:1 (inst/NEWS.Rd:45): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:112:1 (inst/NEWS.Rd:55): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:127:1 (inst/NEWS.Rd:63): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:153:1 (inst/NEWS.Rd:77): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:168:1 (inst/NEWS.Rd:85): Warning: <h4> anchor "Buxfixes" already defined
NEWS.html:213:1 (inst/NEWS.Rd:111): Warning: <h4> anchor "Small-Improvements" already defined
NEWS.html:246:1 (inst/NEWS.Rd:130): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:270:1 (inst/NEWS.Rd:143): Warning: <h4> anchor "New-Features" already defined
NEWS.html:285:1 (inst/NEWS.Rd:150): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:304:1 (inst/NEWS.Rd:161): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:325:1 (inst/NEWS.Rd:172): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:340:1 (inst/NEWS.Rd:180): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:358:1 (inst/NEWS.Rd:190): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:373:1 (inst/NEWS.Rd:199): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:389:1 (inst/NEWS.Rd:209): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:405:1 (inst/NEWS.Rd:219): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:420:1 (inst/NEWS.Rd:228): Warning: <h4> anchor "New-Features" already defined
NEWS.html:438:1 (inst/NEWS.Rd:238): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:458:1 (inst/NEWS.Rd:250): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:486:1 (inst/NEWS.Rd:267): Warning: <h4> anchor "New-Features" already defined
NEWS.html:503:1 (inst/NEWS.Rd:278): Warning: <h4> anchor "Bugfixes" already defined
NEWS.html:541:1 (inst/NEWS.Rd:299): Warning: <h4> anchor "New-Features" already defined
NEWS.html:598:1 (inst/NEWS.Rd:328): Warning: <h4> anchor "Bugfixes" already defined