I've had a pretty serious problem with my blog since I tried to upgrade to 2.2 the other day. For some reason, my header is no longer showing up no matter what I do. Even stranger, when I go to pick my theme, NONE of the themes (either the pre-installed default/classic themes or the ones I have downloaded) show up -- I can choose them, but I can't see them.
Anyone seen this before? Any thoughts?