Error after System Update (Servererror) and now encrypted filename are bogus!

[dennisd76]

Hello,
I've upgraded the TNAS OS, after that it rebooted and after that i couldnt log in cause there was a server error on the TNAS after that!
Then i've read and found the solutiion to reinstall the TNAS. It said that i wouldnt loose any data!
Now its back online and i can connect but my one share that was encrypted shows bogus filenames without any extensions or anything!

Like:
ECRYPTFS_FNEK_ENCRYPTED.xxxxxxxxxxx

Whats wrong? How can that happen?
I need to access my data!