A regular user reported she could only see the previous versions of a file going back to 6/25. Looking at the same file the domain administrator could see previous versions going back to 5/15. I checked security on the version from 6/25 it had groups and permissions associated with the live file while the shadow copies previous to that show only "System" and "Administrators" with full control.
All the scheduled shadow copy tasks have drive F:\ as the destination. It is an iSCSI volume with the Administrators:full control and users:read (probably the out-of-the-box defaults, in other words).
Another item of interest: when users access the previous versions tab, Event ID 55 / NTFS errors are generated in the server's event log with the description "The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume {name of the volume where the live files are stored}." Chkdsk doesn't find any errors when it is run on this volume.
Is this how VSS is supposed to work? I can't find anyone else talking about this problem. If not, is it possible to fix the permissions problem so that regular users can access the older shadow copies of their files? Has anyone seen this problem before?