I believe Dave is correct as well now, you probably are in mid cycle. My motor rotates and swings that arm you are pointing to after a selection is made and it is pulsing the jukebox, locking the other buttons from being pressed at that time. I never noticed that before. Guess I just never tried. The buttons are locked only for a brief moment while cycling. Yours must just happen to be in the exact right position. Now we both know
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. Sorry for any confusion I may have caused. On the other hand, looks like a nice clean unit you have. Good luck!