I have used VueScan from the start. It worked fine until a few months ago then stopped communicating. Changed cables, changed computers. Nothing recognizes the scanner although USBview does recognize that something is plugged in. I believe the scanner is dead. I was looking for repair possibilities.
There is a repair facility for Coolscans advertised on eBay. Just search eBay for Nikon Coolscan and you will find it.