I'm having a strange issue, for some reason I can no longer jog from anything other than my shuttle pro based mpg. We have changed no settings anywhere and when I click the "jog" mode select on the on screen mpg, none of the options (step, cont. etc) illuminate. I can't use the virtual buttons or my keyboard arrow keys anymore. Any thoughts? This machine is used in a production environment and gets a full shift of use daily and no one ever changes any settings so this is a little odd.