Half the time I click on "Save Page" the
next screen is a "Preview"
(and my edits are not yet saved).
This bug is associated with a feature which prevents submission of forms by
offsite javascript. For example, if a hacker wanted a page deleted, they
could write some javascript, put it up on their website, then post a link to
it on the user talk page of an administrator. The bug involved makes some
unknown random event during an ordinary form submission appear essentially
identical to this abuse scenario.
-- Tim Starling
I had been wondering if this was just subtle encouragement for people
to use the preview button more :)