Peter, Varela Round, serif is not a websafe font so will probably display as a generic times variant. The trick is to find where this font has been used and replace it with a websafe font (if listed in V14 it is websafe, but if not listed you can add a google font or webfont).

Having recently upgraded a site, I was surprised to find non-websafe fonts hidden in forms, email settings, pop-ups, menus and various other places. Hopefully Incomedia will ultimately advise where to find "buried" fonts to make the removal process easier (I do know they are working on the problem), but in the meantime if you are getting the warning, the font is in your old site somewhere and should be replaed if possible.