Post date: May 01, 2012 5:43:54 PM
An important note, as this is an issue that's coming up in several projects. I will use big letters.
Don't mix sample rates in your sound edit. If you are using any audio at 44.1 kHz, you MUST convert this to 48 kHz before you mix - otherwise it will go out of sync when the mix outputs.
If you've begun your edit with various sample rates, stop now and convert all the 44.1 to 48, and then reconnect to the newly resampled media. This may take a few minutes now; it will save you precious hours and hours of re-scaling and re-syncing later.