Suddenly no previews (at all), constantly generating peak files without actual files in the folder

I was editing videos and adding simple graphics from envato to the project.

So far nothing special, the usual.

Then it suddenly stopped playing the preview in Program Window.

Waiting, restarting and updating the (Mac)OS, & even updating the app - NOTHING

changed. First time every this issue occured since several years.

It will stop the generation process when not active in Pr, but not instantly, a few moments after.

I can NOT watch any footage from bin in source monitor, no nothing to be honest - no visuals.

Did I press any shortcut to delete peak files? did I have or need peak files to begin with?

Appreciate all the help I get.

see in the lower right corner.