Topic on VisualEditor/Feedback

Today, I ran maintenance/update.php on an installation. Now, when certain pages are invoked with "Edit," an entirely different page is invoked -- it is almost as if an index in the database were skewed. It is now possible to save the page and stomp over whatever was there before. Has this been observed before? I'm not even sure how to debug this -- suggestions will be appreciated!

Here is some version identification.

MediaWiki: 5a3173d06b605a8c86ace08efc9e9c290f7f171a VisualEditor: b6ad119f153cdd0f88e3152c5961785c3d46e72a

For posterity, this was solved; the Parsoid server was pointing at another wiki, so edit requests for a particular revision id came back with a totally wrong page. Whoops. :-)