When doing a silent installation of Plus! when you add ANY script they will appear to be working on the preferences pane, however no commands or script menus will appear ANYWHERE in Plus! where they would normally. This is then resolved by uninstalling then reinstalling Plus!
Recently when restoring a backup of my computer from a Norton Save and Restore file and installing Plus! 4.50 on top of 4.23 to update it, the same scripting error has occurred also. I was hoping this sort of error would be fixed in 4.50, guess not.