Merry Christmas, Photoshop is broken and wholly unusable. Please get a fix as fast as possible.
I have been using Photoshop for decades without any major problems until now. The past few upadates have been riddled with bugs, but none rendered the software useless until v22.1.
The first I notice of there being a problem - while working with any type of file (newly created or old image files), layers become unresponsive. If zooming in and or out, Photoshop fails to display the zoom, or if it does, the image appears glitched.
Then, if grabbing the corner of the image'sa Photoshop window, instead of resizing the window, Photoshop displays a squashed version of the image.
And finally - the nail in the coffin - files will not save, displaying a "Could not save because of a program error" message.