Zoom blank or green screen?

MAJOR UPDATE on this issue:  

By total luck, I've discovered a fix. When you zoom and get black/grey/green screen. Go back,  click on the left mouse button, to enable the + Zoom function (not the Z key or Space key). Image zooms in perfectly. Now, if you hit the Z or Space key, it works as it should. 

Has happened a few times this morning and each time, this fixes it without any need to restart LR etc. 

I've had the same problem since installationof 14.0.1.  The screen goes bright green when I try to zoom using the z key.  I run Sonoma 14.6.1 on a Macbook Pro with M1 chip.  I seem to remember this happened a few years ago during a Lightroom upgrade.  I can restart Lightroom and it solves the problem for a brief period, but it always comes back.  It has only started since the Lightroom upgrade, so i presume it is a problem inside Adobe that needs to be resolved - soon I hope!

Update - this issue is still there. It literally comes and goes. But is becoming extremely annoying, as I am unable to zoom into images to check focus etc. 

Turning off Graphics Acceleration - makes no difference. 
Clearing Cache - makes no difference 
Restarting LR - sometimes clears the bug - but often doesn't, the issue remains. 
Sometimes the issue goes away of its own accord (I have no explanation to that, but it does). 

HELP......!

As nobody else appears to be suffering this issue - is it possible its linked to the Apple Studio Display?  I ask, because at around the same time I updated to Sequoia, I also had a firmware update for the display. But I don't see how that would affect only part of LR - the zooming of the central image. 

Oh yeah and the standard size does not matter indeed if you have 1:1 previews. If that is your workflow, you'll be fine at any setting for standard previews.

Yeah that is correct for your display. I forgot it is the horizontal dimension that is set here, not the vertical. After new standard previews are generated that should make browsing in Library much faster. 

Purging the cache in the preferences takes a while to actually happen. It doesn't immediately delete everything in the cache location on your hard drive. I think it just marks the cache files as out of date.

Have set previews to Auto - interestingly that's 5120 for my machine - Apple Studio Display. Will be interesting to see if that speeds transistions up. As I say, it's been set to 1440 forever. As I generate 1:1 previews manually anyway, as I go along. 

System Settings/Display - is set to Default, Apple Display P3-600 nits, no auto adjust or true tone set. 

Had already cleared the camear raw cache - one of the first things I tried. Had zero effect. Unless as you mention, it got somethign stuck and it's now cleared it. Will be interesting to see if the issue returns. 

> Issue has gone away

Might have been a raw cache issue that took time to get purged. Or maybe some other app was running that put pressure on the GPU memory?

Very strange for sure. I have an M1 Max with similar other specs and have never seen this. The standard preview size shouldn't matter except to make browsing full screen in Library faster if they are high enough resolution to fit your screen. If they are not, Lightroom will have to rerender a new high resolution preview every time. 

One thing to try is to wipe (purge) the camera raw cache which is also in the performance settings. Also you can try resetting the preferences. Lastly, what setting are you using in System Settings -> Displays for the screen? Best to use "default" there. All the other modes use non-integer scaling for the interface and can lead to slow downs. Doubt that has anything to do with this issue. 

OK - to add to the weirdness - I just went to LR (which was still open - its always open on my Mac). Issue has gone away. Like WTF?

Can currently zoom in and out with no issue - apart from a delay in Develop mode (lag). 

That's just weird. This bug has been happeneing to me the last couple of days. Not seen it just dissapear of its own accord before, as I've normally restarted LR by that stage. Will just have to keep an eye on now and see what happens. I mainly posted to see if anyone else was having the issue - but if not, then clearly it's something local to my machine. 

Jao - Yep, exactly why its odd. And this is not an issue that has happeend before updating to 14.0.1 - I'm a professional photogarpher and this machine is in permanet use editing photos. Its something new - for whatever reason. 

Preview size - interesting, I'll change that, but again it's been set to that for about 10 years now (probably longer) so cannot see why that woudl suddenly cause an issue. 

HDR - never use it. Coincidentally tho, I turned it on a few days ago - but then turned it off again. Doesn't seem to affect this issue, so far as I can tell. If it increases performance - then I'll turn it on. 

No, its not Smart Previews - I've never used them as I've never seen the point. As my Macs are always top of the range and can cope easily with the raws.