F8 no longer working in cubase 11 pro

For 2 weeks, working with video, I could use F8 to open video window, play in it, and scrub. Suddenly 2 days ago, I load the same program, but nothing happens when I press F8. It’s been very frustrating. All programs w/o video work fine. The video imported plays properly with audio, though I only see the thumbnails. Any help would be appreciated. Nothing changed with my setup except for the days of the week.

I deleted the F8 key in shortcuts, then re-entered and it works fine. Sorry for not responding sooner.

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