File will not delete

[Arno]

Normally should have the super user all permissions. But this is not really the reason in your case. So any extension seem to modify or manipulate it. Or your asset db table is not correctly.

But i can check (and repair) this with the ACL Manager extension. So i must install this for a 30 minutes. Is this okay for you?


[gelöscht durch Administrator]

[Arno]

I have now used the ACL Manager to repair 28 wrong permissions settings in the ACL. But all this has not  solved your problem.

Fact is, that nobody else from many thousand other users has this problem. So it seems to be a real challenge.
Maybe is the reason a system plugin. I will check also this tomorrow.