When connecting to machines I've had no problems connected to for years, the screen is now just a black box after updating to Windows 10's newest "feature" update (winver 1803).
Confirmed all three machines (this one and the two remote PCs) are using the most up-to-date version of Teamviewer. I updated one of them to Winver 1803, stillsame issue.
Solved! Go to Solution.