Se270d is not feeding the fabric through. The steel piece w/the feeder teeth keeps falling to an angle but when I lift it back up, it seems too high. Also, the bobbin cartridge jumps off track and causes the machine to jam once I try to sew. I am sure when one is fixed, the other will work itself out.

SOURCE: Sewing Machine

check if you are using the original bobbin... There are some similar bobbins but they are not the same...

SOURCE: The fabric doesn't move forward.

We need to do some examining. Remove the foot. Put the stitch length dial at the longest stitch. Turn the wheel and see if the feed dogs move about 1/4 inch. Also check to see that they rise just slightly above the needle plate. If it does these two things it will work. If the teeth don't rise above the plate, remove the needle plate and clean the lint out from between the rows of teeth. If you find a lot of tightly packed lint there this will solve your problem. Reinstall the needle plate and foot. If the feed dogs don't move about 1/4 inch, you probably have a problem which is going to require the services of a technician.
sewman7

SOURCE: Bernette sewing machine making a mess of thread on back of fabric

I once heard from a great sewing instructor that if the problem is on the back of the fabric then it is a spool to needle problem.... if the problem is on the top of the fabric, then it is a bobbin problem. Check your machine for dust and stray threads. Check your bobbin casing for dust and stray threads.

SOURCE: while sewing on singer quantum

Mine did this and it seemed impossible to fix. My problem was a tiny bit of thread stuck in the bobbin cover (but it could be anywhere in the thread route). I ran dental floss through the path the thread follows and also in the bobbin cover and poof out came a small piece of thread that all my looking missed. Hope this helps.

SOURCE: my thread gets stuck down in the bobbin area.

Ensure that you are threaded correctly, set your tension for roughly 4.5 and "floss" your machine when threading by grabbing the thread by the needle immediately prior to threading the needle with your left hand, and the thread on the top by the spool with your right hand; then pull the thread back and forth briefly.
Ensure that your bobbin is in the bobbin case in the correct orientation.
Ensure that your feed dogs are in the "up" position. Many inexpensive machines do not have the option to drop the feed dogs, and I believe your kenmore to be one that lacks the option, but consult your manual just to be sure.
Also make sure you're using a good quality thread. Use a European thread, and definitely avoid anything from the dollar bin or any kind of "dual duty" type thread. Cheap thread causes nasty nasty things to happen to sewing machines.

If none of these fixes solves your problem, let me know; but going through the above will solve 99% of problems like you're describing.

Good luck,

-R