Crash when starting exported package/game

Game is fine when simulating/running within the editor itself.
This all started after the update from 4.2>4.3.
In 4.2 the packaged project works fine. In 4.3/4.4 the exe crashes.
This also happens on my colleague’s PC; he’s packaging it himself, not using my packaged files.

Not sure where the log would be but here’s a copy of the error.

(Running on Win7 x64)

Failed to enter /Game/Maps/Scary_Map: Failed to load package ‘/Game/Maps/Scary_Map’. Please check the log for errors.

Address = 0x7532c41f (filename not found) [in C:\Windows\syswow64\KERNELBASE.dll]
FWindowsPlatformMisc::RaiseException() 0x132dd70 + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:1819] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
FOutputDeviceWindowsError::Serialize() 0x13689c7 + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:113] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
FError::LowLevelFatal() 0x135170c + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\core\private\misc\outputdevice.cpp:348] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
UGameInstance::StartGameInstance() 0x1adf02b + 72 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\engine\private\gameinstance.cpp:294] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
UGameEngine::Init() 0x1ad5eb9 + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\engine\private\gameengine.cpp:482] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
FEngineLoop::Init() 0x12d398a + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launchengineloop.cpp:1871] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
GuardedMain() 0x12d3716 + 0 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launch.cpp:133] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
GuardedMainWrapper() 0x12d3808 + 17 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:136] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
WinMain() 0x12d7328 + 13 bytes [File=d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:201] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
__tmainCRTStartup() 0x1f78ce5 + 14 bytes [File=f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618] [in V:\Temp\New folder\WindowsNoEditor\Distress\Binaries\Win32\Distress-Win32-Shipping.exe]
Address = 0x7598336a (filename not found) [in C:\Windows\syswow64\kernel32.dll]
Address = 0x77109f72 (filename not found) [in C:\Windows\SysWOW64\ntdll.dll]
Address = 0x77109f45 (filename not found) [in C:\Windows\SysWOW64\ntdll.dll]
Address = 0x77109f45 (filename not found) [in C:\Windows\SysWOW64\ntdll.dll]

Hi Feed_Dante,

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, could you please submit a new report for it.