Live Recording Latency Options

[Smokemachine]

hi i just bought a new macbook pro 17 inch intel processor i have live 7 original version and im having some problems

i wanted for some users to try as well because maybe this is a mac problem

i made a track in the arrangement and i want to record a loop of it i make a new channel and make it record the master when i listen the loop and turn the metrome on , keeps in sync thats ok but as soon as i put a vst anywhere in live and make the same thing when i listen to the loop its not in sync even if the vst its turned off the loop is not in sync ......

i can put it in sync i just wanted to know if this is normal or maybe my mac is fucked maybe a core problem

thanks