Storageworks 1280 DLT1 and NTBackup

[CA1169567]

Is anyone else running a StorageWorks 1280 DLT1 Autoloader with NTBackup. If so, what firmware versions are you successfully running?
I've updated to the most recent firmware versions, V.63 for drive, V.40 for the loader, and NTBackup will only backup. Whenever I try a restore (verification purposes), it proceeds to mount the tape, but then announces 'Cannot detect the selected backup device' yet it's managed to successfully mount the required tape. This also happens when a backup through the UI is performed, yet not when scheduled. Any ideas why?
Any help would be greatly appreciated.