Have you tried removing your launch options from steam? This is what the developers suggested on twitter in order to solve this issue. I had the same issue and it was solved this way.

I dont know if this will be of any help since you re-installed. but I have had launch options get stuck somehow before . For instance in the experimental branch when the -nosplash option caused the game not to load, I actually had to put the option in first then load the game and take it out again to get it totally removed.