I have been trying to get my arturia plug ins working on a new mac for a month now, not much luck. I've spent about 30 hours on it. The new mac has Lion on. Everything works in standalone mode, Brass works, the Jupiter works and the prophet works, but ARP, miniMg, Mg modular, CS80 and analog factory don't.
Antoine, it seems he is the only technical support arturia have, has suggested little of use, and I've had no response for weeks now.
My suggestion is don't buy Arturia if you want to use Logic with Apple Lion.