One of the new things in X-Plane 10.40: more modern OpenGL code. I mention this because that new code will probably create chaos during the early betas; we’ll get the bugs fixed as quick as we can.
The problem is that OpenGL can be an exercise in “code it once, debug it everywhere”, and while I have tried to set myself up with a wide range of hardware, I don’t have one of every combination of drivers and GPUs that X-Plane runs on.
X-Plane 10.40 will be a longer beta, like 10.30 was, so we should have enough time to work out the kinks in the new code. Having to do this kind of debugging during beta is annoying for everyone, but it’s also necessary to advance the sim forward.
When 10.40 comes out, if the beta doesn’t run on your hardware, please do report a bug; often users assume that if they see the bug then everyone does, so someone else will report it. Not only is this often wrong (because everyone assumes someone else will report a bug), but it might be that your combination of hardware and drivers is the only one that shows the bug!
Update: yesterday at the 2015 WWDC Keynote, Apple announced that they were porting Metal, their Apple-specific low level high performance 3-d API, from iOS to OS X. I will comment on this next week, after the WWDC sessions on the desktop version of Metal are available on the web. In the meantime, don’t panic – this definitely isn’t the end of the Mac, Windows, X-Plane, or the universe.