Yes it sounds like exactly the symptoms for the pressure on your walking foot being to high. If you can switch to an open toe walking foot that also...
When you fold the fabric you need to keep all the edges parallel to one another. If you do not you will get funny bends in the fabric when you unfold...
When you fold the fabric you need to keep all the edges parallel to one another. If you do not you will get funny bends in the fabric when you unfold...