When using a gradient mesh, a popup suggestion to check out new gradient tool features removes all but keyboard input. Until I can dismiss the popup, I can only use the keyboard, even outside the Illustrator application. Since the popup doesn't dismiss with keyboard input(at least that I've figured out), my only recourse is to save the file, close out of AI and shut down/restart the computer. Working on a Wacom MobileStudio Pro, Win 10, all drivers up to date, Illustrator is up to date.