[Jeff Webb]

Hello, I’ve only had this issue on a Mac Pro using 3 monitors in High Sierra with After Effects CC 2018. I use Windows 10 at home with 2 monitors and AE CC 2018 with no issue.

My solution has been to close all other tabs except for the Render Queue, before hitting Render. This is not optimal, but it allows you to at least view the Render Queue and allow it to pause or stop if you realize there is an issue with your render or need to shut down. Otherwise, my Render Queue is hidden by a different comp, and the error requires that I force quit my project.

I cannot tell what causes this issue, but at one point after updating my OS, I was not able to right click on objects in my left most monitor in the AE project panel until I checked a box in the System Prefs>Mission Control – checkbox for “When switching to an application, switch to a space with open windows for the application”. I think it could be related to how windows are displayed across multiple monitors? I hope this helps.