I am quite sure that there is a solution for my silly problem, but I did not found it.
When I change a user configuration (enable, disable, passwort or something like that) I am not able to save the changes. An access violation error is shown. I have to rename the
/plugins/system/admintools/admintools/main.php
and then I can save the changes.
Do you have a hint how to solve that problem?
All the best