User created from API - cannot login

Hello,

after adding a new user via API function client_add with any password (it pass strongness policy), I am unable to log in to WebGUI with this user and password. When I change a password for this user in admin panel (by admin user) to the same as from API, login works correctly. The user is not locked or canceled.

I have also tried example script distributed by ispconfig3 package, outside of our system and the problem is the same.