If you play with sound off, you need to play fullscreen thanks to a nice bugI have introduced.
(The bug is already fixed, but there hasn\'t been a new client coming out).
About the problem in the top of the thread, it sound like memory leaks. ANd today, when I was using the release client I got that I had to update and I did. What I downloaded were mainly the plugins for the sound from CS.
Those should fix that.