Just upgraded my PB to Tiger today. Max/MSP required to be re-authenticated after the move. Cycling74 was very quick to reply to my email (within a hour) Max opened, and i got a message in the Max window saying it couldnt find Jsui. To fix this i just copied over the "JSRef.shlb" from my old library/CFMSupport to my current CFMSupport folder. Also when trying to open Max for the first time it prompted me to install the new PACE extensions for iLok, which i then proceeded to do. Tested 3 patches that are fairly complex and they seem to be working just as well as they were before. More extensive testing to be done later this week/early next week. Maybe some good news for us Max users.