Avalanche 6.1 - User account limit

Hi

I've a question regarding user account in Wavelink Avalanche 6.1.

There is a LDAP connection having been made and works OK.

Is there a limit number of users account that could be manages in Avalanche as after a while and some user accounts created, there no possibility to log-in with the last created users??

Any comment, suggestions will be highly appreciated.

THX

Elie