RockNRoll:It has a 24 month warranty. I would have to send it back to be repaired or replaced.
What is the "it" you are referring to ????
Please be MUCH more precise and specific in all your answers if we are to be of any help to you.
In any event, its VERY unlikely your trouble originates in your hardware -- much more probable is that something inadvertently was modified or altered on your system that "broke" the feature you had previously been using successfully.
Try exporting as an MPEG-2 -- lets try to find out what might be going wrong ...
When you return, please know the actual equipment, software etc, you're using ...