Problem with an experience window

Hello, I have tried VCMI for the first time and I have a problem with “experience window”. When I click on experience icon, a window with “0” appears (screenshot: oi59.tinypic.com/2lm8ep3.jpg) and the vcmiclient prints the following line in the console:

Cannot wait for dialogs in gui thread (deadlock risk)!

Is there anything I can do about it?