RSM,
Where does the error come from phpBB or Joomla?... May need to PM me some infor about a phpMyAdmin account to peek through your database... Did his phpBB Id in comprofiler indicate 12 as well... Is user #12 in phpBB active and working (also check to see if he can direclty log into phpbb)
Radisan,
Not sure I ever answered your question... Currently there is no option on whether to snyc avatars or not... I am thinking about having Martijn put an option for syncing into the plugin... not sure if it will happen the next release or not... so don't take this as gospel...
Greg