Using alert boxes for troubleshooting, I discovered that one of the arguments passed into the event, which occurs either when the relevant dropdown item or one of the 'tabs' near the bottom is clicked, is in fact an 'undefined' value. The purpose of the value is to reset one lot of elements, while two others in the same handlers that are involved in a similar action are always successfully recognised. Essentially all three states are to be made invisible before the next stage of the function, which is to determine what should now appear on screen and carrying it
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