I run Illustrator on a mac pro (+Psd and Indd) since few years now with no problem (with personnal licence)
I have trouble with Illustrator : cannot select a tool correctly, it's erratic, cannot select an object correctly, it makes the screen scrolling infinitly, when trying to move the window, it stays "sticked" to my cursor...
Tried to have help from adobe but solutions didn't work : unsinstall, cleanertool, reinstall. Still the same.
Everything is ok with psd and indd though. had an older version of Ill, was the same problems.
would love to find an issue ... merci beaucoup
Do you have an extension installed that "enhances" the mouse?
Which mouse is it? Does it work with another one?
Which browser do you use?
Do you have any screensharing app on your computer?
Can you try and shut down. Then reboot and launch only Illustrator. Nothing else. Nothing in the background. No demons or helper apps. Does it work then?
Did this little vid with QT. Hope It helps.
Started with ILLustrator only and still the same.
I'm going to upgrade to catalina to see (IDK why It could help but IDK why this problem suddenly appeared too !)