When I run Autodesk Showcase and import a file, two things happen. When I reopen Inventor, my active project has been changed to Default, and something toggles me from "performance" to "compatability" on the hardware tab. I will post on this topic in the AREA dsicussion forum, I have a feeling like that this may be related to my showcase settings.
I am going ahead with my work here, as the problem doesn't occur everytime, and its just a couple clicks to fix.
Dan