Sections not in model tree
I've never had this issue before, but I got a new computer with the exact same installation of Creo 8.0 so why would I expect it to behave the same. For some reason, sections no longer appear in the model tree when a file is opened.

Now if I try to create a new section, then magically all the existing sections appear in the model tree and I can select them, but NOT UNTIL I CREATE/CANCEL CREATION A NEW SECTION. This is supposed to be controlled with the model tree filters, but checking and unchecking the box does absolutely nothing. Now once I've opened the section creation dialogue box, then the checkbox does what you would expect. But not before you've begun section creation. Really?!?!? Can't you get anything to work right?
