Quicktime not recording screen

you can use the "shift-command-5" keyboard shortcut to launch a new screen recording. (AKA "screenshot app") it uses the same settings and shares the same controls with the QTP app and the results get played back with QTP.

well then, I'm kind of at a loss. I in the past I had the same issue with QTP screen recording. but the shortcut always worked.

which macOS are you on? and are you using an Intel Mac or an apple silicon Mac?

the last time I tried using QTP > File > New Screen Recording was back on Monterey. but the keyboard shortcut always worked. since then I have used the shortcut. I just checked now, and I can once again use QTP to perform a screen recording. I'm running sonoma. but I am kind of hesitant to recommend upgrading to sonoma just to fix this issue, as it sounds like using QTP was working for you previously on Ventura. although I usually recommend running the most current macOS that a specific Mac can run.

other than that, have you installed any antivirus apps on any such app that claims to "speed up" or "clean up" or otherwise "optimize" your Mac?

I got this when trying to capture what was visible on an extended display. Actually it was an extended display that was also mirrored. Capture works fine on my main display. Need to do some more testing to really work out what is happening.

The last idea is the key. I have the same issue and, after close Cleaner One, it works!!

Thank you very much!!

you're welcome. :)