LeeThorogood said:

I would be more then happy to have another bash at syncing the 5.1 audio and release an audio fix like what Adywan did for his theatrical TPM DVD if someone could point me in the direction of a good guide on how to sync the 5.1 audio properly. :)

I asked this same question a while ago when I first started all the audio sync'ing I did, I will try and find the thread, I am pretty sure it is in the how to's, but in a nutshell you need to encode to PAL, then split into 6 mono wavs, load your original audio into Vegas, then your 6 mono wavs, then I muted all the mono wavs but the center, zoom in on the timeline, and wallah, you can see everything you need, again in a nutshell.

*edit- I just read what Ady wrote, you are on a mac, I have no idea either.