Hi everyone!
Just registered to share my experience with this - hope it helps.
I've been experiencing the same problem here - when using alt-tab in fullscreen or entering the menus (in windowed mode), the cpu went to 100% and windows hardly responded at all. All i could do was quitting ccs64 via alt-f4, as even the task-manager wasn't able to start. In my case moving the cfg-file to a backup-folder solved the problem. Further investigation (comparison of the old and new cfg-file) showed that a video option was responsible for the problem.
OPTIONS/VIDEO/UPDATE MODE
good: Automatic
bad: Frame/0/50
The problem is (on this pc) reproducable.
I'm using XP SP2. If you need further Information, feel free to contact me.
I found another 'glitch' as well. As i'm using a Soundblaser X-Fi Card, i quite often use the 24-Bit Crystalizer Feature. This causes Sound issues with ccs. The more you increase the effect, the worse it gets. It sounds like a constant beep. This however is easily resolved by disabling the Option - at least if you know how to solve it... which in my case took quite some time
greets,
eCat