This crash issue was raised recently in general topics and I suggested if I caught it I would report it.
I had a very simple terrain, was doing some smoothing over "sandhills", went to testmode (SP) and it crashed on entry at "initialising physics". (I am doing some scripting work but it was running previously with my scripts with no changes prior to crash.)
On re-entering test mode, lighting and terrain etc. are all reset back to defaults.
If I get any more occurrences that are same error but different process, I'll update.
Quote: "Problem signature:
Problem Event Name: APPCRASH
Application Name: Guru-MapEditor.exe
Application Version: 1.0.0.0
Application Timestamp: 5528c8de
Fault Module Name: DarkLUA.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 554227df
Exception Code: c0000005
Exception Offset: 000043f0
OS Version: 6.3.9600.2.0.0.768.101
Locale ID: 3081
Additional Information 1: 5861
Additional Information 2: 5861822e1919d7c014bbb064c64908b2
Additional Information 3: a10f
Additional Information 4: a10ff7d2bb2516fdc753f9c34fc3b069"
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