umm bit of a problem ....I checked the user database and I had

Warning: 12 entries in the core_acl_aro table without corresponding users table rows.

Following entries of user_usergroup_map table are missing in users table: user id=65 (aro_id=), user id=66 (aro_id=), user id=84 (aro_id=), user id=156 (aro_id=), user id=511 (aro_id=), user id=577 (aro_id=), user id=602 (aro_id=), user id=615 (aro_id=), user id=672 (aro_id=), user id=816 (aro_id=), user id=916 (aro_id=), user id=1604 (aro_id=). This core_acl_aro entry with aro_id 0 should be removed, as it's not allowed.

so I clicked (HERE) to fix the problem and now it seems I have lost the 10300 users on cb except me although I still have users on the joomla users menu

So basically I suppose I have to now pay for a restore or restore the site myself if I have time

this is joomla 2.56

On cb 1.81

Newly upgraded yesterday

synch user gives me eg:

Joomla/Mambo User Table and Joomla/Mambo Community Builder User Table now in sync!

Ive got the users back except my twelve authors

They seem to have vanished eg:

Warning: 12 entries in the core_acl_aro table without corresponding users table rows.

1.56, but it was done by a pro from my server hosting company