I had trouble using the kiosk in FLL as well this Thursday
I didn't print my boarding pass at the hotel in Miami so I didn't need a reprint like you, but when I punched in my True Blue # (how many of you know it by heart? lol, mine's real easy to remember) it gave me that Oops print out and asked to see the agent.
I thought I was just too late to use a kiosk as it was 4:30pm and the boarding began at 4:50pm for a 5:20pm departure. But to be honest I don't know why it didn't work.
I even tried my Jet Blue Amex the second time and received the same error message.
--Russ