Not sure if you have the same problem I had with my Viking Emerald but I had tried everything I could think of. The dealer/repair person said there was so much lint between the feed dogs that they couldn't move to pull the fabric through. She told me to look at the feed dogs from behind the machine because looking at them from the front side you would never know there was a problem. So once in while I plan to check mine.
Guess it proves that I use my machine!!! The machine is a year old but had worked on several minkee projects and flannel blankets so that probably was the culprit. Chris