Until the past few days, I have had good luck with Vue 6 and everything functioning as it should, with the exception of an NVidia driver that had to be updated to stop some minor Vue desktop issues. 

When I tried to render my latest scene my memory usage went off the chart, 93% within a few minutes, Vue locked up, and the system crashed. It did this repeatedly no mater what changes I made to the Scene, Vue, or anything else in the OS. 

This problem affects both Vista, and WinXP, duo processors, x86 with 2 gigs of memory or less and x64 with 4 gigs of memory or less.   I do not known how it would affect a single processor.

I do not use Poser so that is not a current issue, however I would like to share my problem with others, since I have since solved the dilemma and found the cause. This may help anyone else to diagnose a similar problem they are having and possibly resolve the issue.

The problem seems to be SubSurface Scattering based materials andor a combination of Solid Growth, andor Ecosystem. You can duplicate the problem by doing the following; Create a BaobabTree, or use one of the larger trunked tree types, and send to the default desktop; do not resize, and then select one of the two trunk materials. To that material add a second material from the SubSurface Scattering menu, say Coral. Create and replicate 4 or 5 instances of the tree. Set the following Render to Broadcast or Superior, Render to Screen, 1024 x 768 or higher, at 300 dpi. 

If you have a Resource Monitor, monitor the memory usage, and then Render the Scene. The memory should begin to leak, and runout, then Vue may lock up or crash the system, this is an abnormality. This only occurs when I use SubSurface Scattering based materials, or with Solid Growth and as a Ecosystem material. If you create enough replications, this problem can also occur in a scene using primitives or other objects.

Simple remedy; Test each material type group with a Render. Change the suspected material with a default gray material, until you find the material that is causing the problem. Replace the offending material type(s) with something else.  

I do not know if you can remedy Poser with this technique of changing materials.