KeyShot 4 Crash when moving items in large assembly

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I have a large assembly that crashes every time I try to move a model.  It is a consistant crash that happens with every move in this assembly.

I'm on  Windows 7 x64 sp1, dual xeon x5690's, 48gb ram and a nvidia quadro 4000.

Below is the event viewer general listing for the latest crash.

Faulting application name: keyshot4.exe, version: 0.0.0.0, time stamp: 0x51315a31
Faulting module name: luxgeometry.so, version: 0.0.0.0, time stamp: 0x513148fa
Exception code: 0xc0000005
Fault offset: 0x000000000002a41a
Faulting process id: 0x21d0
Faulting application start time: 0x01ce2afb1654c848
Faulting application path: C:\Program Files\KeyShot4\bin\keyshot4.exe
Faulting module path: C:\Program Files\KeyShot4\bin\luxgeometry.so
Report Id: dbe4dd74-96ee-11e2-9312-005056c00008

[TpwUK]

Hi sseager, error codes starting with 0xc0000005 are access violation errors and can be caused by many things including bad drivers, corrupted DLL's etc. If you keep getting the same process id of 0x21d0 then you can use the Task Manager to look up the process ID which should help reveal where the problem is

Martin

[KeyShot]

Would you be able to share the model with support@luxion.com so we can take a look at it?

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I'm sending the .bip file via yousendit to the support email address.  It is a 751mb file.

thanks for you help

Steve