What graphics card are you using? If it is an older graphics card that no longer receives driver updates from nvidia that may be the cause.
I had this exact issue after the 2.9 update. Spend about 6 hours troubleshooting through various methods and ended up putting in a support ticket. The best reasoning that we could come up with is that my graphics card (Nvidia 770) is not longer supported by driver updates from Nvidia. This apparently could be what is causing the game to break. I rolled back to the stable version and was instructed to never let the game update to 2.9. I'm able to run the stable version with no issues.
Please let me know if you find a way to fix this in the updated game. As of now it looks like I'll be playing on the last 2.8 version until I can save enough for a new PC.
