Last August, my DS and I were in line for Space Mountain and had already cleared the first FP+ tapstile. As we approached the interior of SM, all the lights were on and the line wasn't moving. About 5 minutes later, they shut the ride down and everyone had to leave. As we left, CM's were handing out paper FP"s to everyone (FP and SB) who had been standing in line. Yes, I believe that FP was good for SM for the next three days. Again, this was almost a year ago, so I don't know what procedure is now, but back in August, they were definitely handing out paper FP for those who were standing in line for rides (SM at least) that were not working.