Poser and Poser Pro are all relative path now and that will slow down your texture loading and texture loading when rendering.  Especially if you are loading older .pz3 files.  Also there were some changes to OpenGL implementation I think so you need to set that up properly.  Settings are as follows:  In render settings / Preview Tab use OpenGL / Hardware accumulation on /  Transperency Actual on / Enhanced Multilayer Transperency on /  Texture display 1024.

Another issue I noticed yesterday was the new Vista and Office updates effected Poser.  Outlook can't be running on my system if I'm using Poser now.  I have Business Contact Manager installed in Outlook and that may be the culprit because it and Poser use the 2005 C++ runtime.  On Vista you want to turn off UAC(user account control). You can find UAC in the Control Panel / User Accounts.  Also run Poser as adminstrator. This can be done by right clicking on your Poser icon and choose "Run as Administrator, or go into the properties / compatability tab / and check run as administrator. The latter will cause Poser to always run that way.

There are a couple of utilities out there that will go through your runtime and set everything to relative path for you. Check in the MP for those. Also in General Preferences / misc tab /  UNcheck file compression and UNcheck external binary morphs and just below that confirm that your temp file path is correct. 

Hope that helps,

Don