Suddenly, a red contour around the viewports and no playback

I just opened fusion today and it won't work.
I can't playback any node, and I have a red contour showing around the selected view (viewport)

What happened? How to fix that?

Thank you for helping.

Press the "None" button twice to "Some".

Thank you for your help
Is it the button on the lower right next ot"APrx"
I right clicked on it and selected "some, but the problem is still there. Even if I select "all", it doesn't help.
(btw, the "none" indication doesn't change to "some" and stays as is, it is selected in the dropdown menu but it doesn't indicate it by showing "some")
Any suggestions?

The red frame on the active view doesn't go away when you select All?

no it doesn't go away
And, as I said, the none mention isn't updated on the button.
I tried uninstalling and reinstalling, even the 7.5 version, the issue is still there.
It must be a hardware conflict, or similar, as there is no reason the program wouldn't work, I didn't change anything, and it was working yesterday.

this is toggled by the "scroll lock" key on the keyboard

if you have it on, then fusion will stay in "none" update mode

Thank you very much michael! That was it!
It really helped me, I was in the middle of a production!