I had a problem with the camera. Apparently I fixed it by “Frame camera bounds” but I still don’t understand why it didn’t work in the shading views, why it distorted the image why I couldn’t pan left and right.
Here’s a video
You must share your Camera Properties.
Hi, I hope this helps. I can also attach the file if needed. Again, it was fixed very simply, but I’d like to know why because I don’t want stuff like that while I work a job.
It seems to have very short timespan until it deletes it 
https://www.veed.io/view/cb1e62b8-0545-43fc-9c01-8a9a192c2e22
I uploaded the file itself so someone can try (without clicking Home since that seems to fix it).
03 Breakable 01Aaaaa.rar (960.9 KB)
I think that what happened is that you panned the camera view of that window outside of the scope of the camera before checking lock camera to view. Note that the window in your file on the left works fine in camera view.
When you hit home the window resets so that the view is centred on the camera again (without the pan)
But then the rendered view would also not work. Solid and Material view don’t work, however Rendered view works but a bit distorted.
Good point, I now tried render view in that window and it did not render anything on my rig. The frames were flickering between 3 and 0 so there is something buggy going on. I do not have a wide screen high res screen maybe the screen res has something to do with it.
Nah, I have regular 1080 monitor and 1650x1000something 4:3 old Cintiq This is really confusing because I was in the middle of working a project and this happened. And If can’t figure out what that happens, it might happen again in the middle of the next one.
I think Blender 3.1 has a bug.
- Select your camera and “View > Cameras > Frame Camera Bounds”
This will fix your problem.
But when you select camera and start Viewport Render, Cycles begin render again and again (endless loop). If you select another object, this problem gones. You can report this issue to Blender Bug Report page.
Yes it does seem to be a bug thing, I confirm that the centre window of your file was acting strange on my rig too.
At least if it happens again you can fix it by hitting home 
When I hit home in the window to fix it the file rendered OK, BUT one thing I did notice is that the render was stretched, I looked at your output settings and saw you had the Y aspect ratio set to 1.2, if you set it to 1 the stretching will disappear.
