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Encountered using Chrome 36.0.1985.125 on Mac OS X (10.9.4). It is not present in Firefox on either Mac or Linux. I'm not a Moderator (or 10K user) on any other sites, so I can't test and see if this is a issue across the board or not.
We don't support zooming at this point in time...
So, yes, visual "glitches" are expected in such cases.