KDM logout error

Hi: I get a kdm [failed] message when I logout of SuSE 7.2. I have an nVIDIA graphics card although I do not have it configured for 3D. Also when I log out of an account the Screen will blink twice before the GUI reappears. A am very tempted to chalk this logout failure to the nVIDIA. I just wonder if anyone else is having this problem? -- Cheers, Jonathan