Permissions can not be changed
I had V. 2.1.8p2 installed. I noticed a huge amount of registrations from spam users. Some of these users were able to change the config data (I noticed that via the log/time stamp at the end of the file). So I installed a new Forum (V. 2.1.9) and imported the data (Vanilla Porter).
Now I have the problem that no role permissions can be changed in the forum. Every changes get just resetted after saving.
What's happening here? The spam user registrations didn't stop after new installation. Is this a serious security issue?