CC 2019 does not play nicely with others.
I'm testing AI CC 2019 for production work on High Sierra and Mojave.
When I open CC 2015 then 2019 the later will not work at all. Can't even close the app. Have to "Force Quit".
After restarting 2019 it seems to work, but I no longer trust it. Are there known issues with running 2019 along with previous AI CC versions?