Since v04.01.03-421 no USB Drive in DLNA

My Cloud OS 3 Personal & Network Attached Storage My Cloud
3

Other share are fine, now I tried this: http://community.wd.com/t5/WD-My-Cloud/DLNA-Media-Server-does-not-detect-any-media/td-p/837534

and receive    USB: interner Serverfehler. (400255)      (internal server error)