I received a Book Port from a user that was no longer making use of the reader. I installed the software on my computer and let it update to the newest version of the software. I was able to authorize the player and move a book from Audible to the memory card. The issue I am having, is when I push a button on the Book Port, I just receive the message "application missing". I read through the manual twice, but see no reference to this issue. If anyone has a fix, I will be very appreciative. Rick