IE9 RC just displays blank pages
We had this with the x64 bit beta, and had to uninstall all x64 IE versions, then re-install the x32.
Once we completed this, all the pages were showing correctly.
Good Luck
This was a graphics driver issue. I fixed it by updating the nvidia drivers. Windows told me they were up to date but I downloaded newer drivers from the nvidia web site.
One way to test this is to turn off hardware acceleration, restart IE9 and see if the pages appear.