OK the first time it happened I thought it was just a server hiccup. But it's happened 2 more times now.
If I preview my post (using the WoW skin and Firefox browser) I get a weird unformatted preview screen. If I hit post from there it won't actually post. It goes to that same weird preview screen (if I go on a different tab, there is no new post from me). It will post after I hit it a second time but it will still look like that white background, unformatted text bad screen. This is a recent (like maybe since 5pm EST) occurance.
Possibly related - around the same time I've noticed that my "Save changes" on the wiki now creates a prompt for me in Firefox to open wiki.htm and asks what I want to open it in. If I say no I'm back at my edit screen but if I open the page in another window my changes have been saved. If I say yes I open an empty screen.
/shrug