I tried printing this evening and the option seems to have been removed. The Ticketmaster rep indicated that the Print at Home feature was turned off by the "vendor". I am assuming that was the UFC, but I have no idea.
I asked to have my ticket emailed to me via pdf and they indicated they would do that for me within 10-15 mins. After about an hour, I never received the tickets via email. I called Ticketmaster again and they attempted to resend the pdf ticket.
I finally was told by the 3rd Tickemaster operator that the UFC has turned off this feature and that I could only get the ticket through a ticketmaster outlet in the state of the event (Nevada) or via will call.
They charged me for that print at home feature initially and then switched it to will call. Lame.