Just found this:
http://fedora.cis.cau.edu/~pmolnar/CIS200P11/Pong/OpenGL.framework/Headers/CGLIOSurface.h
Does “changing IOSurface on the CPU” only mean CPU rendering? Cuz I guess there’s a IOSurfaceLock and unlock. Not sure if that would help sync things when it comes to weird issues like this??
EDIT: Oh you seem to already know about it. Quite a frequenter on the Apple lists 😛