Cursor keys no longer work in the FD when the viewer pane is open and displaying an image. However, the Home, End, Page Up, and Page Down keys still function.
Yes, just noticed the same here. Selecting a file in the file display and using the arrow keys to jump to another file stopped working correctly. Sometimes I can jump just one file, sometimes two up/down maximum (after reselecting a file with the mouse) but jumping back to the previously selected file or sidways in thumbnail mode doesn't work either. Rebooted to see if that would help, but same behaviour (13.23.1 beta).
FYI, with the viewer pane open the arrow keys are also blocked during inline renaming (changing the text cursor position with the arrow keys is currently not possible anymore in this combination).
Same for the Standalone viewer, cursor keys can no longer be used to change to next picture (or whatever shortcut you have set for them).
The cursor keys seem to be hard-mapped to moving selection now, but this happens even when nothing is selected, which I hope is not intended 
@Jon & @ Leo Thank you for solving this issue so rapidly, working all smoothly again in the newest beta ! 
