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Just another note. The problem seems to still occur on XP64. Vista64 works fine.

I found the problem. For 64-bit platforms (XP64 and Vista64) when you use 3rd party COM DLLs you sometimes need to set your "Platform Target" to "X86". Visual Studio defaults to "Any CPU". It may be useful for NaturalPoint to update their sample projects to reflect this need.

Couple Points of Clarification:

1) The samples and my application work fine on Windows XP.
2) All code is compiled with Visual Studio 2005.
3) The Vista64 error generated is not useful. It just tells me the application had to close.

<t>I've attempted to run the OptiTrack c# Multi-camera example on Vista64, but the application generates an error. In addition, I wrote my own C# application that uses the optitrack.dll. That application crashes as well. From my initial testing it appears that Vista 64 throws an exception as soon as...