Baren*eh*ked_canadian

Alright, I need a little help before I throw this thing out in the yard.
My friend sold me her embroidery machine after she couldn't get it serviced where she lived, so she bought a new one. I had it serviced here, it worked perfectly -for one day.
Now, I keep getting a tangle. I can't even stitch one single stitch without a tangle and it jams the machine up. I took everything apart and cleaned it, re-set the tension, re-threaded it, got rid of the tangle and everything. I tried different fabrics, different stabilizer, different pattern (including one that worked yesterday) new needle, and I'm using the same bobbin already threaded that I was using yesterday.
Any ideas before I have an aneurysm?

My top thread is getting stuck as it goes around the bobbin, and instead of pulling the bobbin thread up, it just pulls the whole bobbin case up against the cover and then the thread breaks.

mermaid

You remembered to put the foot down before stitching? You rethreaded with foot up? Your bobbin unwinding right direction? It really sounds like your thread jumped out of the take up arm. Feel around the bobbin race for any nicks--also the needle plate opening...thread can hang up there and cause a mess. Nicks can be filed down with emery cloth. Usually when the nest is on the bottom, it means the problem is on top...in the threading or the tensions.