A snapshot operation required by this job was unsuccessful

Hi folks

Got a minor issue that's a little confusing. We're running Backup Exec v12 and have a daily backup that includes flat files, SQL databases and Exchange w/ GRT and AOFO enabled.

Each day the backup completes successfully with exceptions. The email notification is as follows:

(Server: "<servername>") (Job: "Daily Backup") The job completed successfully.  However, the following conditions were encountered:

<#> files were skipped.
A snapshot operation required by this job was unsuccessful. Check the job log and the Windows Event Viewer for additional information.
Note:  The backup job was configured to use the Advanced Open File Option.  However, files were skipped during backup processing.  Please ensure that the Media Server <servername> is properly licensed with the Advanced Open File Option, or that the job is properly targeted for media servers that are licensed with the Advanced Open File Option.

If I double click on the Job History entry, a Job History tab opens - there's no Job Log tab - and therefore there's no details on the skipped files, snapshot issue, or AOFO licensing problem. Furthermore, there's nothing in the Windows Event Viewer that's relevant; the only entry has what is already detailed in the email notification.

Correct me if I'm wrong, but there really shouldn't be having any AOFO licensing prompts, as it's included in Backup 12, and shouldn't there be a Job Log tab in the Job History dialog?

Any help anyone can offer would be appreciated.

Cheers,
Georgia