Title says it all. Usually happens when pressing multiple buttons simultaneously.
Could you please send us a log with a crash call stack? You can find it in Editor subfolder of ~/Library/Logs/Unreal Engine. Thanks!
Thanks, but all of these say editor quit cleanly, without a crash 
What mouse do you use?
What happens is that it stalls and I have to force quit it.
OK, thanks. One more request then. When it stalls, please open Activity Monitor app (in /Applications/Utilities) find UE4Editor on list, select it and use View->Sample Process option to generate a report on where did it stall. That may help narrow this down. Thanks.
What keyboard layout do you use (System Preferences->Keyboard->Input Sources)? It seems that engine gets stuck because OS X is processing some keyboard events, but I don’t have enough info to even try to guess why It does some string operations as a result of keystrokes, but that doesn’t look suspicious. And I cannot reproduce this on Macs I have here Maybe you could find a more specific repro steps?
OK, thanks. I’ll ask our QA to give it a try. Sorry I wasn’t able help right away.
I’ve tried reproducing it but was unable to, it seems to happen somewhat randomly.
Hey Moshe,
Just wanted to check in and see if this issue still occurs in 4.3, and if so, if you’ve tried it in 4.4 yet. Let us know!
Hey, I’ve been playing around with 4.4 and so far have not come across camera pan crash but instead run intro freeze/crash when trying to use undo button. (I am now on Windows 8.1 client)
Thanks for update, Moshe!
It sounds like other problem you’re describing is a separate issue, so please open a new post in Bug Reports section so we can address it there. Make sure you follow guidelines for reporting a bug, found here:
Thanks!