a simple rule to remember, If the thread tangles on the top of your fabric, the problem is with the bobbin. If the thread tangles on the bottom of the fabric, the problem is with the top (i.e. threading, needle, etc.)
It is probably something simple, like putting the bobbin in the case in the wrong direction--just try flipping it over, front to back.
I do think it is a good idea to visit your dealer again for a quick tutorial on how to outsmart the machine.
Good luck, and don't get frustrated! :thumbup: