I encounter the error "Could not nudge the selection because of a program error." while attempting to nudge a selection using Ctrl+Arrow key when no layer is selected (as opposed to "... because selection is empty"). I think this could be more clearly presented. Thanks!
OK, normally you nudge the selection with just the arrow keys, and that still works.
You nudge/move the contents of the selection with command/control-arrow, and that gets a program error when no layers are selected.
Ok, that's reproduceable - and I'll see if I can get that fixed.