i do have the same problem. avatar isn't displayed for some users. i have no clue why. no special usergroup whatsoever, and in the forum it works.
and it has been an error in photopost too, we just upgraded to vbgallery 2.4.3.
i cant find any permission settings to disable showing the avatar nor any other setting affecting the avatar.
and ive posted a few other bugs since weeks. when will a new version or patch be released? i didnt even get an answer on my error reports or with huge delay.
seriously, your customer service and bugfixing needs improvement. this isnt what im expectng from a comercial product. even the open-scource plugins i use have a better support.