I really really need you guys to post more info. Please refer to the first page for that.
@Marirae: I just tried. I have no issue. Could you post some more about your setting. Do you have the EP yet ? Is it a new house/game ? ...
@luludaisy: What's your graphic card ? Please refer to the first page for graphical issues. If those are not your issue, please come back with preferably a picture and a lot more info about your graphic card and drivers.
@gr1zzly: Tried my existing game. No issues. I really wonder what causes this bug.