Lost 2-up vertical in a single window
Up until just now, I've been able to use Window > Arrange > 2-up vertical as a way to display two images side by side in a single window. Now I can only get it to do it in two separate windows. The deal-breaker is that in this mode, the current window changes size whenever I zoom in or out, overlapping or obscuring the other window, whereas before when it was two side by side images in a single window zooming didn't change the window size. No idea what I'm doing differently, it just seemed to work before. Thought it might have something to do with viewing in tabs first or using fullscreen mode but doesn't make any difference. Any attempt to Window > Arrange jumps out of full-screen mode and/or tab mode and does two separate windows.
Completely shatters my workflow.
