I have a second monitor to increase real estate for panels, such as effect controls. When I move the effect controls window onto the second monitor, it looses functionality. I have to move it back to my main screen to make adjustments.
HP 22er monitor, connected via HDMI, out of a Thunderbolt dock.
This was not always the case, seems to have started perhaps after update to High Sierra.
I am running primarily AE 2015, for compatibility with work system. And it is quite stable,
unlike some recent versions I have played with.
I don't think I've ever heard someone say CC 2015 was more stable than anything... I've found every version since its release to be an improvement. The latest version (after the latest update) has been especially good.
Sorry that I don't have anything more useful to suggest. If you're going to update your OS, you have to be prepared that updating your software might have to happen too.
- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.