User:Mike Christie made ten small (often single-character) edits to [[w:en:2002 Pacific typhoon season]] recently. Edits #1 and #3 produced a generic error of "Something went wrong", and it appeared the save had failed.
In both cases, the save worked. The diffs are https://en.wikipedia.org/w/index.php?title=2002_Pacific_typhoon_season&diff=624878218&oldid=624550518 and https://en.wikipedia.org/w/index.php?title=2002_Pacific_typhoon_season&diff=next&oldid=624881675 None of the other, similar edits made to the article (including one in between these two) produced any errors.
Mike usually edits in Chrome on Windows 7. I've seen the same behavior with a generic "There was an error" message in Firefox on Mac OS 10.8.5, so it's probably affecting everything.