KMail and KDE3.1 B2

Hi folks, just wondering if anyone has managed to get KMail working under 3.1 Beta 2? I've installed it (and love the look of it BTW), but KMail won't start. When I try and run it from a console I get Xlib: extension "GLX" missing on display ":0.0". and it segfaults. Any ideas? I think the linkages to the various configuration files are OK (although I could be wrong). Thanks. Peter Nunn.