I tried to block an IP global. The following happend:

1. I was logged in
2. I submited the block
3. I was logged out suddently and get "permission error"
4. I logged in again
5. I submited the action again
6. Nothing happend
7. I tried again
8. I was logged out again

After some tries I got it, the IPs was blocked, but I guess there is a problem with login actually on the master?