Accounts Pro uses SQL DMO, which is depreciated (other components use SMO and are OK), so if using SQL Server 2008 (R2), then download and install Microsoft SQL Server 2005 Backward Compatibility Components onto the Workstations.
This tool (Diagnostics-v2.exe) can be useful for repairing Integration settings, but it will enter an incorrect path for Accounts Pro, so fix that afterwards with the Configuration.exe located at:
C:\Program Files\Common Files\Digita Shared\Integration\v2.00\Configuration.exe.
Make sure location/path is correct, for the various apps.