GMOD Start up crash

I have reinstalled it and restarted steam, this is happening to my friend too. It minimizes and I have to shut it with Task Manager, my friends GMOD says “hl2.exe is not working anymore” Whats going on?!

Whats going on ?! WHAT IS GOING ON ???
APOCALYPSE !!! D: 2012!!

That is massive Valve’s fail not you only

Same thing is happening to me maybe theres an update?

Did anyone else get something saying “Validating downloads / Files”? too??

Keep it in this post

http://www.facepunch.com/threads/1117242-Another-engine-update-broke-gmod-won-t-start-up-KEEP-DISCUSSION-IN-THIS-THREAD

And what is causing that is a engine update broke all source games but some games have been patched like Tf2, CSS and some more, garrys mod hasnt though

Anyone know when it will be fixed?