Branch: Binary build, started from launcher
Version: 4.4.2, latest download (cannot check the build number in the editor since it crashes before showing the user interface).
Description of the issue: When launching the UE4 editor, the crash reporter appears with the following error message
SIGSEGV: invalid attempt to access memory at address 0x3
EngineCrashHandler(FGenericCrashContext const&) Address = 0x9e263df
(filename not found) [in UE4Editor]
PlatformCrashHandler(int, __siginfo*, void*) Address = 0x9f30e7f (filename not found)
[in UE4Editor-Core.dylib]
_sigtramp() Address = 0x87e125aa (filename not found) [in libsystem_platform.dylib]
When launching UE4Editor via the shell (from /Users/Shared/UnrealEngine/4.4/Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS) I get the attached log messages. I tried removing the preferences files as suggested in this thread but this does not change anything.
This crash does not happen with version 4.3.x or below, it also does not happen with version 4.4.x built from the GitHub sources (last verified with the currently latest commit 093d35b, but also with several other versions starting from commit a4d74c0).
I verified the installation, and removed and reinstalled the 4.4.x version twice, so this issue does not appear to be related to the roll back to a prerelease version described in, e.g., this thread.
System Specs: Slightly underpowered for UE4: 
- MacBook Pro 8,2
- Intel Core i7 2,2 GHz
- AMD Radeon HD 6750M (and Intel HD Graphics 3000)
- 8GB DDR3 RAM, 1333 MHz
- OSX 10.9.4, Darwin Kernel Version 13.3.0