Yea.. as I've been exploring.. this is what I think is happening.
Sites can check your Flash version upon entry, and redirect you to a different page if you don't have that version. A lot of sites will do this because they have a certain feature which will only work with that version.. the problem, though, is when they don't update it when a new version comes out. It causes the site to think that you don't have flash installed.
Really annoying. I'm finding web design, in general, really annoying lately. NONE of these browser work the same and they all render sites differently. And not completely differently.. but enough to make it infuriating.