[vtkusers] Assemblies "coming apart " during long test runs....

[Richard Frank]

We are seeing a strange behavior. We have a model of an human internal organ, made up of a series of triangle meshes. The are between four and seven sets of meshes combined into an an assembly. During a long ( multiple hours ) automated test, where a surgical instrument is moved through the scene repeatedly ( Made from implicit function sources and also combined into an assembly) , there is an issue - and the best way for me to describe it is that the assemblies " come apart.  Each actor in the assembly is moved to a deferent place in the scene, as if perhaps they " exploded ". We have videoed this and there seems to be a screen flash before the happens. 
Things keep going, there's no crashes, etc. 

Has anyone else experienced this? Does anyone have an insight as to how to track down the problem?

Thanks 

Rick

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