Problems creating, modifying and deleting users

[waltervalderrama]

Hello everybody.
I have a pretty serious problem. There was an incident with my server:
- ISPCP Omega 1.0.6
- Centos 5.5 x86_64
- 16 GB RAM
- Intel Xeon 5540

One of hosted clients upload a script and hacked all "index" files on it, log files, postfix configuration and ispcp database.

Fortunately most of things had a backup and were restored.

But one problem still persists. When I try to create, delete, modify or change users passwords via admin panel, nothing works. (see attachment)
I tried to change a password and I only see a "modifying" message.

Any help would be appreciated. Thanks