FLStudio was open. I noticed today that I couldn't "Fast Sample Preview" anything from the browser so I reinstalled FLstudio on my computer. Now I have both issues where I can't listen to YouTube ...
FLStudio's File Settings, then dragging them from the FLStudio Browser into the Playlist
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I'm not sure what else to try, but it just doesn't make sense to me how it works only for new projects ...