I wrote that I followed all these advices but with no success:
I´ve tried to log in as root, I deinstalled the hole Master Collection and installed it again, I´ve tried CS5, CS5.5, CS6, (with all updates) I deleted all Adobe plist files in prefrences folders (system and user), I deletd these sound plist ( com.apple.audio.AggregateDevices.plist), I created a new user account and installed it there, I´ve tried to repair the rights... but nothing works for me... (Should I do a clean reinstall of Lion?)
anyway thank you
anybody else here using premiere pro with a macbook (MacBook Pro: i5, 2.4GHz, 8GB RAM, GT330M - 256mb, Lion 10.7.4 , 40GB free space) ? maybe the hardware is to slow?
So I fixed the problem with a new and clean install of OSX Lion