Game wont launch on steam after beta 2 update

Posted on Friday, October 17, 2014
Game now wont start? Any ideas?
Ok so up until the last update this game has run totally fine! Now it says preparing to launch and does nothing. Ive noticed my chat icon go green as if im in game then switch back to blue after about 3 seconds. This happens everytime. I have tried a fresh install and running in admin mode!
Does anyone else have this issue or a work-around/fix for it?