[sixpointmusic]

>BScout
Thanks for the comment.
Nothing is in Record when this happens.
I turned off the auto backup and set the Undo to 1. No luck.
Activity Monitor shows PT is using CPU=108% Memory=1.80GB when the session is running. When I create new audio tracks, CPU jumps up to 206% (Memory usage stays the same), then says "Not Responding" and I get the spinning wheel.
PT's system usage looks normal. (CPU=30%, Memory=15%). It freezes when I create new audio tracks.
I attached the screen shots of playback engine and system usage. Please check. Thanks.

>musicman691
Thanks for the comment.
I attached the screen shot of my memory implementation in my previous post. I have 8 slots. So I should get rid of 4x4G and replace with 2x8G?
hm I wanna solve this without spending any money but I'll try that if I can't find any alternative. Thanks.