Mikkel, I am not logging into two accounts at the same time. Rather I am seeing the following... 1) Boot Fedora Core 7 with the livna fglrx drivers installed. 2) Login at the gdm login box to any account. 3) Logout of the X windows back to the gdm login box. 4) Login to any other account except the one you first logged into. 5) Run 'glxgears -info' You will find that glxgears produces the error messages... > FGLTexMgr: open of shared memory object failed (Permission denied) > __FGLTexMgrCreateObject: __FGLTexMgrSHMmalloc failed!!! in the terminal window you executed the command from. The glxgears program only runs without errors in the account you first logged into. Any other accounts will display this error until you reboot and login to that account first. I am seeing this on multiple machines and am shocked no one else has noticed it yet. I can only assume this is because lots of people stick to a single account on their machines. Jack