P: Compare View on 2nd Monitor shows no image on Zoom.

I am having the same issue. LRC 13.0.1 on Windows 11, RTX 3050 Ti

If it can help, in comparison mode, the problem does not exist.

Oui, cela fonctionne. Le fait de désactiver complètement l'accélération graphique permet de récupérer la focntion zoom sur l'écran secondaire. C'est un bug avéré en V13.0.0 et en V13.0.1

Further to my earlier post, I observed that loupe zoom only works on the bottom left of the image but it seems that is only for landscape images.  For portrait images it only works on the bottom right of the image.

I too have the same issue as everyone else on this thread.  Second monitor loope-view zoom in the develop module only works on the bottom left quadrant of the image (I suspect that some who are getting a completely black screen are clicking on the upper right portion of the image).  Using Lr 13.0.1, Windows 10 with Nvidia GeForce GTX 1070 and latest drivers.  Like others, the problem goes away if I disable graphics acceleration and it wasn't there until the 13.0 upgrade.

same here

as stated in subject.

in some cases, not always, second the quality on the secondary Monitor is extremaly bad.

in some cases 100% view works partially, but the screen shows only the upper or lower part of the picture. Can't move to see the upper or lower part.

This was introduced with the latest major update. 13.x

Further to my last post, when I disable the GPU acceleration the problem goes away. looking forward to an update to fix the bug.

I am also experiencing the problem of the screen going black when zooming in on the second screen. it actually zooms in to the wrong place - the image is magnified out of view at the bottom left and the view is of the black space to the top right of the image. Additionally, and this is not mentioned in the other comments on this thread, the image turns rather redish orange when in Develop mode on the second screen. when I reverse monitor functions the problem stays with Lr Classics second screen - ie the problem moves to the other monitor. Uninstalling 13 and reverting to LrC v 12.5 the problem disappears.

The bug is affecting my second monitor also. Any attempt to zoom in geater than 100% results in a blank screen or an enlarged image shifted down into the lower left corner of the display. I have an NVidia GTX 4070 in a brand new MSI Aegis R. I just upgraded the driver (Game ready) today and there's no change. I then loaded on their new arts and graphics dedicated driver and still no difference. It only goes away if I turn off  the Graphics Acceleration. It has to be related to LRCC's use of the graphics accelerator.