v14.3.4730, win 7, lenovo system update is not visible.
Launching lenovo system update, the app is not visible with TeamViewer, however it's visible when using RDP.
Edit: also other win 7 notifications, Intel HD graphics Control Panel, etc are invisible for TV. Same with latest v13
Edit: Found the fix, Options > Advanced > unselect "Ignore alpha blending on this computer"