Continuous Crash Problems OSX Upon Save

This seems to be a duplicate of JIRA [Link Removed]:
https://jira.ol.epicgames.net/browse/UE-7289

User claims the editor crashes every time he goes to save his level or play in editor.

Callstack: Unable to locate on Crash Reporter/User suplied

MachineId:6401A28742D33A9A89816D8472593EEF EpicAccountId:

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: TargetDelegate [Link Removed] [Line: 5407]

KERNELBASE + 37901 bytes UE4Editor_Core + 3092349 bytes UE4Editor_Core + 1597688 bytes UE4Editor_Core + 1479058 bytes UE4Editor_UnrealEd + 9502651 bytes UE4Editor_Engine + 5012673 bytes UE4Editor_UnrealEd + 9881575 bytes UE4Editor_UnrealEd + 4557402 bytes UE4Editor_UnrealEd + 4660963 bytes UE4Editor_UnrealEd + 1801811 bytes UE4Editor_UnrealEd + 6686342 bytes UE4Editor!FEngineLoop::Tick() + 3876 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2214] UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131] UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126] UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202] UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Not Reproduced Internally