2.0 wiki pages loading indefinitely

I have a few different wikis that I use with great gusto, and a few days ago I finally migrated to 2.0. One of them is working just fine, but the other two are both having the same problem: every time I try to edit an existing page or create a new one, the page basically hangs indefinitely, displaying a "Loading" message in the right pane but never actually getting anywhere. I've left it in loading state for as long as overnight, but the page remains blank and never opens for editing. Is this happening for anyone else? Does anyone have any suggestions for resolving it?