I have some code that uses framebuffers. While the code seemed to be debugged and working fine, I was occasionally getting strange GL_FRAMEBUFFER_UNSUPPORTED errors on some runs. After a while I discovered that if I had Firefox running in the background for a few hours, I would start getting this error. Killing the Firefox process lets my code start working again.
I didn’t have this problem under GL 3.0.0, but do under GL 3.3.0 (or maybe it’s the latest Firefox release). Anyhow, I suspect the answer is ‘don’t use Firefox’, but if anyone has any other insights as to why this may be happening, I’d be interested in knowing.