I also had some problems with the 6.0.3 patch that couldn't be reproduced at DAZ.  When I uninstalled and reinstalled up to 6.0.2, there were no problems.  There was something about the version 3 that was messing with me.  (Files refused to open, etc...)
However, I've since upgraded my computer (new motherboard, processor, and a clean install of Vista followed by a reinstall of everything (including 6.0.3) and now its running like a champ.
Go figure!