This is only happening to me on Apple Computers. It started to happen on one client, then another, now all apple computers. Very frustrating. Seems to be an issue with the apple computer... You need to give give TeamViewer accessiblity information. It's under System Preferences, Security & Privacy, Accessibility. Under this section you have to click the + sign and navigate to the Applications folder and add the Teamviewer app. This is horrrible for people that have a lot of apple computers. On the flip side, Apple does ask you to do this when you are installing the latest version of TeamViewer. This is for OS X 10.13 and 10.14 maybe earlier versions too, but for sure it is required for 10.13 and 10.14 Hope this helps someone.
... View more