Sampletank plays back outta time

Sampletank doesn't play back in time with the other tracks I've created. There is no click track, yet for some reason when I record a track it sounds good, but when I play it's completely out of time. Any suggestions? Thanks. Kon, Melbourne Australia. Intel Mac Mac osx 10.4.8 2.16 GHz - Intel Core duo 2GB ram

It is probably the sample buffer, the higher the buffer, the more midi delay, try 128 samples, that one should help or use the midi offset.

If you're not using a click, how do you know it's out of time?