How To Sync Voice Recording Playback

Hi everyone
I just downloaded Audacity 2.0 for my Mac OS X laptop (Version 10.7.1) and I was recording my voice and it does not match the instrumental I was recording it with. It is not in sync with the instrumental but plays back a little before I actually started recording. I was wondering what I could do to fix this? I worked with Audacity (an older Audacity version) before on my older Mac computer and it worked just fine so I was wondering if there was a bug in the new version.
If anyone knew how to fix this problem it would be much appreciated.
Thanks again everyone

If you recorded your voice in perfect sync and it plays back out of step, that’s recording latency which is an adjustment.

We produced a very nice wiki on multi-track/overdubbing.