I've had numerous problems with the materials window showing up in other rooms and being able to click through the materials window into other rooms. I'm not sure what graphic chip my system has off the top of my head (I'll check when I get home). Odd thing is, I haven't had any problems like this with any other program on that machine. Still. I'm sure Anthony is right and that it must be either a problem with the system or a user error. After all, the problems I'm having couldn't possibly becaused by the program now could they?