connecting threads works like a charm in my 6600P.
in addition to rethreading your machine as already suggested ...
make sure you have the feed dogs down.
make sure the bobbin area is clean.
check your tension.
ensure you are using the correct size needle. (for quilting i usually need a 14 or a 16.)
make sure the bobbin thread is going in the right direction. (i don't want to admit how many times i've put one in backward. LOL)
if you can fit one into your budget, the special bobbin case for free-motion quilting is worth every penny. it isn't critical to a successful project but it does make things much easier.
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