Me too. XOOPS 2.2.3 and latest cbb. I have the problem on my live site as well as on my local test system (without cbb or any other modules)! After uploading a new avatar I get a blank site. The debuger tells me:
"Fatal error: Call to a member function on a non-object in ...\kernel\object.php on line 954".

Strange to say the uploaded avatar in fact is successfully saved in the upload folder. You can check this on admin site (avatar lists). Nevertheless the avatar is not shown in the user profile.

Is there still no resolution for this problem? I am really in a fret for this reason. Two different systems, different MySQL and PHP versions, different modules installed. May it can be caused thus a system setting? Ive googled the whole web, I already tried everything possible.

We need help! Where are all the professionals, the programmer, the gods?
Excuse my sarcasm but I still hope there is one person out there who can help us.

Greez from the cold land of the domesticated barbarians
Björn