I am getting the same problem. I believe I have tried to restart DWM.exe in attempt to "refresh" it but it did not fix the problem. Has anyone have an idea about why this happens? I have to admit I have not looked into this much and this post was the first thing I landed on. I will update this as soon as I find more information. This had always annoyed me, but I chose to ignore it. Now I find this particular annoyance happening more frequently now since I just recently purchased Battlefield Bad Company 2 three days ago (I'm already level 21). This was also an issue that existed in Vista, I was very irritated that this was not fixed in 7. Personally, I find this problem a big disappointment in 7 in my books, regardless of all the other things it does better at than any previous version.