Hey all of you who are having the white square problem. It will take mea couple of days to get you better steps to take, as the same problem is happening with another script, but the solution is in the HKEY section of the registry. I'm not very computer literate, I just know how to follow directions.
Part of the solution is going to wherever the HKEYs are and go into the Peristent folder, while MM is closed, and delete the Pretty Pictures file and I think another file and they must conflict. I will have to search my other posts to see if I can find it for you. I think the same problem was occurring with the Behind TitleBars script, so if you don't want to wait for me to find my posts, go to that thread and see if it is there.
Good luck and sorry I can't help now, I'll get to it asap.