Re: Xinerama, with acceleration
According to your bug report, you're not using Xinerama (its commented out in your xorg.conf). Was this bug report generated while the problem you're reporting was present?
Beyond that, I have a few questions:
0) Does this problem reproduce with 1.0-8178?
1) Why are you using the ConnectedMonitor option?
2) Per the NVIDIA README, please remove the dri and GLCore X modules from your X configuration. They are incompatible with the X nvidia driver.