When cropping an image, it’s not always possible to hold down the arrow keys to reposition the image within the crop boundary. Sometimes it doesn’t move more than one step. It’s a little frustrating and inconsistent.
It seems to have something to do with what’s in focus - when I click the image and it becomes focussed in the Properties panel (under Fill), then holding the arrow keys works. When it’s not focussed in the Properties panel (but still selected on the canvas) it doesn’t allow you to hold the arrow keys, yet you can still move one step at a time.
I’ve only noticed this behaviour happening recently.
Of course, you can drag to quickly move the image within the cropped area, but this doesn’t snap to the pixel grid (even when snap to pixel grid is turned on) - but this is besides the point.