I have the same memory leak here.
After some rounds the games becomes unplayable and I need to restart my PC. Sometimes it happens very quickly.
I'm runing the game in two different PC's and it happens on both of them.
Desktop:
CPU: Intel Q8300@3.0GHz
MB: ASUS P5Q Deluxe
MEM: 4GDDR2 Kingston
GPU: AMD ATi 5770 1GDDR5 Vapor-X@960MHz&1350MHz
Laptop:
CPU: Intel Core i5-450M
MEM: 8GDDR3 Kingston
GPU: AMD ATi Mobility 5650
The only thing in common that I can find is the fact the two PC's are runing ATi graphic cards equal or older than the 6XXX ATi series
