After upgrading to DVDFab 188.8.131.52 and requesting a new registration key the expiration column is being updated to May 22, 2009 rather than “Never Expire” for DVD to DVD and "Never be used for DVD to Mobile. I purchased DVDFab Platimum in March of 2008 which per a post in the forum by Fengtao: "All purchases prior to May 5, 2008"qualify for the never expire entry. I have requested the key 3x with the same result.
In the email you received with your version 6 key, highlight the key leaving out the asterisks and copy. Open Fab, highlight one module at a time and paste in the key. DVD to DVD then Mobile. See if that works for you.