Re: 16:9 Displays 1280x768 1360x768 and rotation
For the 1360x768 issue, does it reproduce if you comment out the 1360x768 modeline? If so, please start X with the following command:
startx -- -logverbose 5
and then generate and post a new bug report.
Per the NVIDIA README, the RandR extention cannot be used with the "Rotate" option. Your X configuration is requesting both, however that shouldn't result in instability. Please verify whether using each one separately also triggers the crash.