Last modified: 2012-09-27 01:10:53 UTC
I noticed this problem in http://translatewiki.net sometime ago and confirm it again today, so code should be pretty recent.
So Vector skin on, and toolbar off ?
Yes.
Cannot reproduce this on test.wikipedia.org Probably translatewiki.net runs an older version of mediawiki than wikipedia does. There are a number of known bugs that are only solved in wmf-deployment branches.