Directional keys and selection jumpy

When using keyboard directional keys to navigate thumbnails, selecting thumbnails either using the mouse and keyboard combined or keyboard alone, the selection jumps around about 90% of the time. I use Bridge to help sort photos into folders and I cannot count on my selections.

Additionally and maybe related, moving thumbnails to folders sometimes fails. I have to drag them over multiple times before they finally go into the folder.

Using current & updated version of Bridge on iMac and MacBook Pro, both laptop and desktop do the same thing.