After Patch to 9.02: Drive unable to decrypt data

Hello there,

yesterday we patched a few testsystems from 9.01 to 9.02. Now we´ve got an weird error, only concerns the MSL Tape Library.

Following Error-Message in a Backup-Session:

[Critical] From: BMA@TESTSYSTEm "MSL"  Time: 06.01.2015 07:30:21
[90:6100]     Drive unable to decrypt data: Invalid decryption key retrieved from key management server.

[Warning] From: BSM@CELLMANAGER "TESTSYSTEM"  Time: 06.01.2015 07:30:20
[61:7109]     Medium in device "MSL" cannot be initialized

After that the Tape is blank. Its simple to get it back, we just have to scan it. To test if its really only concerns the patched systems, we run a backup on that tape from a non-patched system and it works perfectly. After that we run again a backup on that tape with a patched system and we get the same error.

(Theres no encryption option used!)

Is this an known error? Or do you have any solutions?

Thanks!