Consistency check fails for one database in a DAG

Hi

We are using DPM 2012 R2 to backup an Exchange 2010 SP3 DAG containing ~20 databases.

All databases but one get backed up perfectly. The one that fails keep reporting that: "Replica is inconsistent".

We have verified that ese.dll and eseutil.exe are the same versions on DPM and Exchange servers and tried manually started a "Run synchronization job with consitency check" without any luck.

I can't seem to find any logs that provide any more information regarding the error. In the Application Log on the Exchange server, event 9782 (Exchange VSS Writer (instance <xxxx>) has completed the backup of database '<dbname>' with errors. The backup did not complete successfully, and no log files were truncated for this database.) and 2007 (Information Store (4020) Shadow copy instance 2981 aborted. 

For more information, click http://www.microsoft.com/contentredirect.asp.) are logged.

Immediately after that, events 9616 (Exchange VSS Writer (instance <xxxx>) has processed the backup completion event successfully.) and 9648 (Exchange VSS Writer (instance b64d02c5-07b0-4a02-a9aa-f8dfb92bd42f:2981) has processed the backup shutdown event successfully.) are logged.

I don't have any ideas where to look - anyone?

Thanks in advance!

/Michael