TeamViewer not connecting after OS X System Upgrade

BNEX
BNEX Posts: 1
edited May 2023 in General questions

I'm running a Mac using Teamviewer 7 and OS X 10.11.3 to remotely connect to my Father's Mac 1000 miles away.

It worked perfectly for years when he was running OS X 10.6 and Teamviewer 7. However when he updated his system to OS X 10.11.3 it suddenly doesn't work.

I can make the the login connection but the remote window of his machine never appears on my screen.

Thanks in advance for your help!
[the personal information has been removed by a moderator]