steam update

I play via steam and when I tried to launch the game this morning after the uptade it didn't open. I've already tried verifying integrity, compatibility, running on admin mode and nothing works. Has this happened to anyone else? I would really like some help. Thanks

I'm not sure if I'm posting on the right forum, but today my game updated. I'm currently using Beta 1.5.5 on Steam, but when I look at the update history notes it doesn't say anything; I was wondering what was updated?