Maybe try this experiment, if it's not too much trouble: edit the postbit_legacy template, and find this line:
Code:
<vb:if condition="$show['avatar']">
and change it to
Code:
<vb:if condition="$bbuserinfo[userid] == 1816 OR $show['avatar']">
That should force it to show avatars for everyone, but only for you (it looks like your userid is 1816). See if that makes the avatars look right.