This is a user Forum, so you are not really addressing Adobe here, even though some Adobe employees thankfully have been dropping by.
Try hiding and showing the Rukers (cmd-R).
Otherwise does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
Thank you- you fixed it. Turning off the graphics processor worked.
Unfortunately this is no proper solution as it invalidates GPU dependent features (like the Rotate View Tool and some Filter acceleration for example) but it indicates problems with the GPU driver or the OS.
Everything worked perfectly before the update. This fix enables me to meet my deadline.
Try to check the GPU maker’s site for newer (or older – unfortunately also an option) drivers later.
Just updated Photoshop to 21.2.1 which supposedly had a fix for this bug, but it doesn't work any differently. Tile view still doesn't show the whole image; "Show Rulers" fixes it in one image at a time; Disable Graphics Processor is also a partial solution.
I've been having this problem lately too and turning off Graphics Processor fixes it. And showing then hiding rulers is a temporary fix.
The processor is ATI Radeon R9 M395 and a browse of the available drivers at AMD shows drivers for Windows, Linux, RHEL, and UBUNTU, but no Mac. Plus they date back to 2015, so not sure it'd help anyway. Maybe time for a new graphics processor?