I have used my voucher. You enter your name, then WDW, then the numbers you use for the first box is the number that is after WDW on your voucher and then enter the date using only 2 digits for the year, and then there should be 2 three digit numbers ater Tr: enter the second 3 digit number. That is how I got mine to work.
Example...... on the back above swipe strip....... 05/25/2005 WDW: ### Tr: ### ###
The #'s would be your numbers, I just didn't want to put any digits in.
Hope this helps!!