Quote - What they have in common is OpenGL. You're using the preview renderer, and probably using hardware accelerated preview. As the features and abilities of OpenGL are increasing with each release, so too does Poser's reliance on those features. It's not unusual that P6 isn't revealing a problem while P7 and PPro 2010 are.
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AHAH!!!
That was it!

last month my Geforce card died and I replaced it with a Radeon card (with catalyst drivers of course) . The new card with different drivers must have been causing the issues using openGL.

I just went into the preview render options and adjusted some things and the memory usage during preview movie compiling went back to its normal "flatline".

Thank you very much!
yay! I can get back to work now!!