I'll just copy paste from another thread :)

To everyone who had problems logging in. There were some API problems and our IT guys have fixed this. Everything should be back to normal. Sorry for the inconveniences. Also the updated version (which will be released soon) will be presenting some messages in the status bar when connection problems occur, so everything should be handled appropriately.

I am usually pretty quick to reply, but when it's 3AM Warsaw time, I'm usually not on the forums. :P