When I start Epson Scan, my thumbnail preview is grayed out. What should I do?

• When the ADF is attached to the scanner, the thumbnail preview is grayed out. To enable the thumbnail preview, Do the following:
  
  1. Turn off the scanner.
  2. Disconnect the ADF option cable from the scanner.
  3. Turn on the scanner.
     
     The thumbnail preview option should now be available.