Hi, for me OSX 10.5 and max/msp/jitter/loops works great...no problems so far! But I still use the 'old' lloopp version - maybe there are some problems with the new one...I don't know! I use a 15" Powerbook PPC G4, 1.5 Ghz and Max/MSP 4.5 + 4.6, no problems with both... Happy new Year to all the lloopp users, Tim