This is the most typical problem we come across on the Russian Community Forum. People complain that they do not have access to the Admin-Panel block accusing us of the problem. However, it turns out that the problem is caused by your Ad-blocking software, just because such a software analyses the page code and as soon as it sees the pun-admain container it tries to cut it.
If you have the same issue try to turn off your ad-blocking program first.