Created attachment 144883 [details] apitrace replay --verbose --debug: stdout NB: stderr attached separately. Note that it stops after a certain swap buffers call, so I can only guess something occurred leading up to that which would cause difficulty. I note there are some attrib pointer calls in-between that and the previous swap, which from my understanding of bug 105251 was one thing that could cause crashes - however while that test program was fixed in the git build, this issue was not. I lack the knowledge to spot which particular call is the bad one though.