terraduino:
Clearing browser cache (and restarting Opera) worked for me to get rid of the "ban".IMHO just a caching problem and no real ban.
Best
I cleared the Chromium cashe and that made no difference. I then used BleachBit to clear everything from Chromium and that too made no difference.
EDIT : I have just cleared Chromium history again and now it seems to be OK ! But why was I banned in the first place?