I honestly dont know. I didnt suffer from most of the issues others have complained about with the older patches 1.07 and 1.08, and I just started a game with 1.09 yesterday. If there is a memory leak then it needs more than 1.5h to build up.
The things that I need further patching for are balancing and optimization (loading times
) issues rather than bugs per se. NPC pathfinding and a fundamentally faulty journal being the issues that really can be considered bugs.
Have you looked at the official forums at
www.jowood.com? There might be more useful info there. The places I frequent arent that informative regarding bugs.