Mac OS streaming issues--audio no video
I have previously used screen mirroring from my Macbook Air M1 2020 (now with Mac Ventura 13.0) to send TV viewing to my newish 2020 LG tv with no issues.
Currently, however, I turn on screen mirroring, and get audio fine, and can see my mirrored laptop screen header bar and cursor on the LG TV, but the streaming picture is blacked out.
If I use my cursor along the program progress bar at the bottom of the screen, I do see the little miniature, postage stamp size video version of the program, but it will not expand to full screen. Bluetooth is off.
Any idea what I am doing wrong?
MacBook Air