Curves tool backround color

I have a problem with Images->Adjustments->Curves tool. The backround is black it should be white. Now I dont see the curve. Does anybody know how I can change the backround??

PS version is 7.01 and WinMe

Max,

Did you change vid drivers recently? Go to control panel and run the System applet. Look for Performance and find Video Hardware Acceleration. Set it to NONE. If the problem goes away, you need to either update or roll back your vid drivers version.