When online ticketing fails...
If you're looking at this now, approximately 7 hours after the tickets have gone on sale, you're already 6 hours and 59 minutes too late for online reservations.
Does that mean you shouldn't go to the festival? No and you don't necessarily have to give up on the films of your choice either. You just have to wake up super early, wait online and buy the same-day tickets that they usually leave room for.
Check the BIFF website for where to go and how to buy in person.