Version up to 4 worked ok, but 4 has a problem on my computer. Every once in a few hours the windows is like frozen, I can not move it to tray or close it, the messages do not show any more. But I can exit it and open it again and works again.

So the application isn't frozen, jut part of it is. No messages in message window but white background and move/close/iconify screen does not work.

Any clues if this can be fixed?

I have used version 2 andit worked good. I also tried some beta of 4 and it worked good. Now I bought version 4 and the 4.0.18 doesn work good. Also tried earlier version of 4 and no good.