I tried to restore an item from my back-up, however the Time Machine App does not start.
I use the latest version of OS X Lion 10.7.5 (Build 11G63).
I used the work around by opening my back-up volume with the finder and copied the wanted item.
However, this is not the correct approach I think.
Does anybody have a solution to my problem?
Just the last addition to my question.
The modifications of the access rights took very, very long. In the end I cancelled the process.
Nevertheless, time machine now works correctly. As far as I can see it.
If anny runs into similar problems. The solution is I think just to modify the access rights on the back-up volume to read and write access for everyone.
Probably OS X Lion added an undocumented feature to the time machine.