From En:Wikipedia

"Interesting one that i just wandered across while looking at an old Articles for creation backlog drive, that causes a very interesting error popup to appear (Tested in Firefox 22)

Navigate to http://en.wikipedia.org/w/index.php?title=Baylor_University_Institute_for_Oral_History&diff=555106174&oldid=prev
Try to edit the "Mission" section in the VE.
Result: An error popup stating Error loading data from server: parsoidserver: Error contacting the Parsoid server. Would you like to retry?
This seems to be caused by the "oldid=prev" part. Normally this loads the revision prior to the Diff part of the URL, but it seems the VE cannot handle that correctly. Excirial (Contact me,Contribs) 21:25, 2 July 2013 (UTC)"

I tried this and had the same experience on Chrome.

Version: unspecified
Severity: normal