Looks like your top tension is too loose because the bobbin thread is eyelashing it like that on your curves. Additionally, moving to fast going through the curves can cause that. Here is a great link to superior threads with a little diagram to help you remember.
http://www.superiorthreads.com/educa...bottom-tension
Unthread your machine and run a knotted thread through the top tension disks to get out any little tiny pieces that may be stuck from your thread break. I read here yesterday a dollar bill will also work (I've always used a length of thread with several knots in it, think of it as dental floss for your tension disks :lol: ) Rethread the machine and do a little test sewing strip of normal sewing. If all looks well give it another shot.
If all looks well but you get more thread breakage you may need to loosen up your bobbin tension just a tad so you can safely loosen your top tension without getting the eyelashing.