I may have to defer this slightly to Martijn (martijn189) as I am not really an avatar expert... but my guess is that phpBB might have a different limit on avatars (say pixel size or file size, maybe even naming)... Any of those possible?
Do I need to email Martijn? Does he check the forums here?
I am sure it is something small...
FYI, I have set the Avatar settings to the same values in both phpBB and CB but they still dont show. I think having users modify their avatar/image in CB and simply displaying in phpBB is the best way to intergrate both profiles....
I hacked some of the code in the phpbb template file so that when a user clicks "profile" or "memberlist" it goes to the CB profile or memberlist. This way, the profile part of phpbb is not used.