My recently purchased 07 Spider was at the shop (I live in Italy) having some work done under the one year warranty. My top also catches on the roll hoop on the right side only. The mechanic showed me a small spring (1/4" dia, 2" long) which has become disconnected or broken. It's inside the top (hood to most of you folks) near the right, upper edge of the rear window glass. He says it's a long job to disassemble the top and fix the spring, so I need to schedule another full day at the dealership. They acted as though it's a known problem, but they also act like they know how to fix it.
That is NOT the case with my intermittent top operation. Like others, my aft deck won't close all the way when the top is being closed. The seemingly competent mechanic worked all day on it and finally got it to work four times in a row by late afternoon. Sure enough, the first time I tried it after I got home, it failed. Sigh.