I tested CoffeeCup HTML Editor version 12.7 build 456 today on Crossover 12.1.2. The OS was Bodhi Linux 2.2.0, running kernel 3.8.0-12. WM is Enlightenment (E17.1).
I experienced very odd behavior, whereby when you interacted with the main program window (clicked on a menu or toolbar button, clicked one of the nav tabs on the left, etc) the main window would jump down the screen several pixels (approx 20). This did not occur while typing.
If you need me to provide any more details, let me know, I'll do what I can.
(Opened support ticket 938983)