the usermanager is not showing me users more than 892 ?? after that users are getting registered and creating albums but i can't see them..
last one i have it 892 is this some magic number in the code as demo trial number ..
No, many admins have more than 892 users. This is most likely a timeout or some other server based limitation.
This thread details a solution for a problem like yours. It's not an exact match, but it could help you start looking for the cause of the problem.
http://forum.coppermine-gallery.net/index.php?topic=1073