I am having a problem with launching the beta for Rebellion. The launch screen  on Steam comes up and says the game is launching, but it doesn't launch. 

My question is this: is this error occurring with Steam or somewhere else? My guess is that it is with Steam, but if it is somewhere else, that would save me some time.

Any suggestions for solving this problem are welcome, btu I've spent a day looking at it and have not solved it yet. 

P.S. I have tried all of Steam Supports solutions, and none have worked so far.