I have used DVD Flick since 2006 but since about November of 2008 the audio of the torrents I burn to DVD have been slightly off. Is there a way to correct this?
Try using FAVC for the conversion. It's similar to DVD Flick but I find that some files convert better - the sync problem included. You could try demuxing the original audio from the source video and save it as a wav file. Then load the video in DVD Flick, 'Edit' it to deselect the audio and add the wav to see if that makes a difference.