Here is an interesting link that explains the difference between the two better than I can for others that may be wondering.
http://www.ihffilm.com/videostandard.html
You don't say what version of Converter you are using or what format you are converting to. In our beta version we do have the NTSC option for burning DVDs. Give the beta a try and see how it goes for you. What program are you using for editing also.
If you continue to have a problem this is something that tech support would need to see. Thanks.
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