Check the size of your thread and make sure you are using the right sized needle for the thread. If I recall correctly, OMNI is size 40 and I use a 4.0 needle on my APQS with that thread. this is the same as an size 18 or 110. Don't know what type of machine you have but sometimes a burr or groove will develop in the stitch plate or one of the needle guides and will also cause shredding. I really haven't had problems with OMNI shredding. Also just recheck the threading of your machine to make sure you haven't missed anything. The few times I have had problems on my machine, I have taken out my manual and gone step by step because, yep, I think it is right, but nope, I missed something.