I started having this problem on upgrade to Lucid with NVIDIA hardware. The OverrideGPUValidation fix doesn't do anything for me. The up_threshold trick described in Bug #367739 seems to be working, though. If I understand correctly, this is just a workaround: it makes sure the CPU can pick up the slack when Flash doesn't take advantage of hardware acceleration.
I started having this problem on upgrade to Lucid with NVIDIA hardware. The OverrideGPUVali dation fix doesn't do anything for me. The up_threshold trick described in Bug #367739 seems to be working, though. If I understand correctly, this is just a workaround: it makes sure the CPU can pick up the slack when Flash doesn't take advantage of hardware acceleration.