Switching from large to small image can get stuck zoom at max zoom distance.
Exact steps for others to reproduce the error
Go to image editor with blank image grid and zoom all the way out until you can't anymore.
Create a new image with default size (1024 x 1024).
Zoom out a little more.
Clear the image by hitting X to switch back to the default blank grid.
Zoom is now stuck.
Found this while working on D2289.