This problem started today on an install that has been stable for quite some time.
Anytime I click on the "Update Post" button, the system starts to think but never progresses. The post is never updated, but no error page is displayed; the new-page loading bar moves a little bit but never completes.
I can still put up a new post, but am unable to update.
I had a browser crash earlier which may have been during the update, so I thought maybe I was being locked out from updating in the same way that happens if multiple users try to access a post--but I'm the only person with access, and it never shows the warning that such is the case. Also, it happens on other posts which weren't being touched during the browser crash.