Brian Gleeson confirmed earlier today that in order to support Internet Explorer 11, CK Editor has been upgraded to 4.3.2. I'm not sure what's changed with that version, but it sounds like that's the root of the problem. Possibly something to do with how skins are applied or perhaps that particular skin doesn't conform to the model for skins in 4.3.2??
Author: Oliver Busse
http://about.me/oliverbusse
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