bobbin thread woes

[pink-vegan.livejournal.com]

Hi there, my sewing machine is grumpy! It's been so for awhile, I'm trying
to troubleshoot myself before lugging it in to the shop!

When I turn the handwheel after I've threaded, the bobbin thread doesn't
come up like it's supposed to...it doesn't come up at all. What would
cause this? I have a new needle and new bobbin case, I think I've set the bobbin thread right. The thread seems to get caught down there on the bobbin when it's looping around.

I have pulled up the bobbin thread a bit forcefully and the stitches I can do when threading the machine that way are a mess. The bottom stitches are a bunch of loops and the top stitch looks normal. I had the machine serviced last summer and haven't used it much since then.