Hey Farmer, glad you got back. As corny has mentioned what files are you trying to burn? vob or an .iso file?. Imgburn has its own burn engine ( same one used in DVDD. ) Maybe try not having DVDD running along with imgburn, just use Imgburn and see what happens. This is just a long shot though without having a log to view.
About the wombats and celery, don't mind us, we just like kidding around but the guys do seriously know there stuff when it comes to trouble shooting.