After reading the posts made since my last post, I did a little more experimenting. I had thought compatability view was turned on by a menu selection on the desktop icon. However, in IE9 it's toggled on and off with the "torn page" icon at the top of the page in the address bar. The mode selected, on or off, is "sticky". That is to say, it stays in the last selected mode when IE9 is closed and restarted later. So, thank you cerberus1, problem solved. The confusion over using copatability mode was mine.