My video quick preview isn't working whenever I use the spacebar browsing on Finder since I updated to macOsMonterrey

Click on Apple icon on top left Menu bar, Force Quit: Preview and Quick Time Player (if they are running), and Relaunch: Finder. This should fix the issue with Quick Look (pressing Space-Bar to play or display file contain), as it does for me. I'm running MacOS Monterey on Macbook Pro M1 Max.

FWIW, you're the second person to report this problem: Quicklook isn't working after Monterey up… - Apple Community

On the other hand QuickLook works fine for me on the three Macs I have running Monterey.

System Version: macOS 12.0.1 (21A559)

Kernel Version: Darwin 21.1.0

2020 MacBook Air M1

Restarting the finder resolved the issue for now. Im still not sure what causes it to crash. Works fine for days, then just suddenly doesn't. I had been restarting the whole machine, nice to know a simpler workaround for now.

Note that this does not happen on my Intel Mac mini running the same OS and patch level, and as far as I know 99% of the same apps.

THIS HAPPENS TO ME TOO. Relaunching Finder fixes it.

lol You're welcome. I wish I knew what was causing it.

Thank you very much, this solved the issue for me too.

Quick preview had stopped working for me too after the latest macOS update-reboot cycle, but now is back to normal.

Thank you so much. I've struggled with this issue since a month.

Thanx, this worked! runnin monterrey in M1 PRO