problem with decorative stitches
 

I just got my machine back after having a new motherboard installed. Today I was trying to do a zigzag stitch and after a couple of stitches the fabric won't move and the stitches keep sewing in the same place.

Any suggestions on what may be causing this?

I can do the blind hem stitch o.k. but none of the others will work.

Is your bobbin threaded correctly. I had the same problem today and it was an incorrectly threaded bobbin.

is your stitch length too small

Are your feed dogs up an in the correct position?

I figured out what it was. I just got a 1/4 inch accufeed foot. It had a different plate with it. I thought they looked the same, but I changed back to the original one and it works fine. I don't see any difference in the 2, but there must be something different