Cannot connect to company file on file server

SOLVED

I have the connection manager installed on the server, users in question have full control access to the directory (NTFS) where the company file exists, they even have local admin access on their workstations.

Everyone has FC on the share permission.

I can get it to work by running AS the domain administrator on the workstations..but that's it. Even if I 'run as administrator' without credentials (IE 'using' the users admin privileges, but not the domain admin credentials) it still fails with the error:

'Sage 50 cannot open the database because the database engine reported an error. Please see error log for more information'

Sage 50, 2013 u2

Works fine with company file local on the workstation

Thoughts?