Hey All,
I went to use UE4 today after using it fine earlier this week and the launcher won’t load without crashing. It seemed to update itself and now just crashes every single time. I even tried to reinstall UE4 with no success.
What to do?
crash logs provided
link text
I have the same problem
Bummer. 
Yeah Getting the same thing here. I Got the update literally 10 minutes ago and Now every time I launch the Launcher, its just instantly crashing… from what I have read online. there was a few issues they are meant to be bringing out a hotfix for it. but thought I would also mention I am having this trouble to raise there awareness.
Glad I am not the only one! haha 
Thanks for the reports! We’re investigating right now, will get back to you asap.
I also have the same problem…
Even downloaded and reinstalled the engine without any luck.
Glad I came here, I almost re-installed as well. It crashes anywhere from instantly to long enough for me to hit the ‘Market’ button and then crashes; always within a few seconds though.
Wish I hadn’t reinstalled but I freaked and immediately did. At least I didn’t pull the trigger on reformatting the OS though.
It also crashes for me after a split second. I can see the launcher but then crash.
Yeah, done that too many times. “oh no… something isn’t right… FORMAT!” lol
Hey Everyone, apologies for the issues you’re seeing.
We are reverting this update (there was a bug fix to the library release that went live yesterday), and the previous build should be live in the next 5-10 minutes. [Edit - Reverted Build is Live!] Thanks for your patience!
Carlos
Thanks for the information.
Thanks it works!
Back in business!
Thanks Carlos <3
Working! thanks