I just had this same issue but just recently got an update from Adobe and now Premier Pro works fine with my 4K display. (Perfect timing as I just signed up for CC three days ago) Apparently it is in the October 2014 release. https://helpx.adobe.com/premiere-pro/using/whats-new.html#updated_UI Seems that when you sign up for Adobe you don't get all the updates at first maybe?
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