Sonicwall LDAP login issue after upgrade to 6.5.1.2 from 6.2.x

Hi all, i have Sonicwall NSA2600 appliance with 6.2.x firmware and connection to LDAP for firewall admins access.

2 groups from AD (example fwadmins and fwro), fwadmins - member of built in group Sonicwall Administrator, and fwsro - member of built in group Sonicwall Read-Only. Users who are members of these groups have successfully logged on to the firewall, but after upgrade unable to login. All LDAP settings correct and all LDAP tests pass successfully (bind and user authentication).

When a user logs on to the firewall, they receive an error - "Login error - See log for details". On Logs i can't see any failed attemps or something.

Perhaps someone has already faced a similar issue.