Ok, on a completely fresh install I can't get unity-2d to start (with exactly the same reports as mentioned above). So at least that means that the "after unity has been used" is a likely red herring. I have in the past had unity-2d start, but ::shrug::.
Some interesting things that might be relevant:
1) We're using the nvidia-current drivers.
2) This is a dual monitor setup, with TwinView enabled. (However, we get problems with single-monitor setups too.)
Ok, on a completely fresh install I can't get unity-2d to start (with exactly the same reports as mentioned above). So at least that means that the "after unity has been used" is a likely red herring. I have in the past had unity-2d start, but ::shrug::.
Some interesting things that might be relevant:
1) We're using the nvidia-current drivers.
2) This is a dual monitor setup, with TwinView enabled. (However, we get problems with single-monitor setups too.)