Hello Volker, in the last NB 4902 i think there is an bug.
Under Disks - Management is permanent the status of the mountpoints "Fehler - Wiederholen" (Error - Retry). (I use the german GUI!)
When i click on retry theres no change of the status. But the drives are correct mounted, so i can access to the datas.
I think thats a bug in the GUI and could be a trap for some people.