In my case: it's simply a matter of editing any css file in any epub on Windows Vista (the only O.S. I've tested so far).
As soon as you make an edit (any edit) to the css file, the code repositions itself so the line you just edited is in the center (vertically) of the Code View Tab. No matter where the line was vertically before you altered it, it will end up in the center after.
I currently can't make it NOT happen on that machine.
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