Booked flight at end of May to Belfast from Donny. Having paid, it wouldn't print tickets or receipts. The link said something like, 'oh, this is embarrassing!' However, when I checked my email, I was able to print both at once. There are bound to be glitches, and I'm looking forward to my flight. Glass half full!
(As a minor annoyance, the website seems to deal in American dates and times like 5/27/14 at 5:05 PM, but on the actual eticket it reverts to what we are used to).