TPI's last paragraph here is most telling. Kinda sad actually.
"We rode Escape from Gringotts after the celebrity red carpet event on Wednesday night. (Brian stepped into the same seat Matthew Lewis [Neville Longbottom] was stepping out of at the load/unload platform.) On our first ride, the ride system stalled during the first troll attack, leading us to creep through the next two scenes in a slow-motion safety mode, before picking up the video during the initial Voldemort attack. Unfortunately, the audio failed to synch properly, keeping us from following the rest of the story. When we returned to the station, the Universal ride attendants kindly allowed us to remain in our seats for a second attempt, during which the ride functioned flawlessly.
Unfortunately for many other invitees, Escape from Gringotts didn't accommodate them with complete shows, and most others we spoke with this week failed to get through without interruption, or to get on the ride at all. Universal has declared July 8 to be the official public opening for Diagon Alley, allowing the park nearly three more weeks to work out all the kinks and get the ride functioning with more reliability. "
We must remember however, that the safety systems are set to hair triggers right now. I wonder if the rides reset requires eyes-on of each components reset. I recall that spider-man was just as sensitive back in 1999.