My top thread keeps catching and bunching up under the needle plate.

SOURCE: BabyLock Proline upper looper thread keeps breaking

I ended up switching the spools of thread around. Apparently, even though I had purchased good quality threads, one of the spools was wound in a way that made the thread loop and twist around. So I put the offending spool of thread through one of the needles and put the needle thread on the upper looper. That seems to be working. By the way, BabyLoc was very unhelpful dealing with this problem.  Thank you!

SOURCE: Not picking up the Bobbin thread

Sounds like you have to take off the throat plate and clean out threads under it.  Sometime they ball up and prevent the needle from going down and catching the bobbin thread. You can't see themuntil you take off the plate.  Follow the directions.  It is easy.

SOURCE: top thread - not bobbin thread - bunches up under

this is a top thread tension problem . make shure thread is between tension plates and spring is contacting the plate if the tension number is high

SOURCE: I am having a problem

try a different spool of thread & see if that solves the problem ,, I've gotten thread that would easily break & just used it for sewing quilt squares,,,if another spool does not help try a new needle

SOURCE: threads stuck under needle plate

take a tiny screw driver & gently unscrew the screws in the needle plate ,, make sure not to damage the screws & clean out the thread & any lint in that area & also the bobbin area
because if the screws are the slightest bit damaged then when you sew & the fabric moves over them the burrs on the screws will pull the threads in the fabric & can damage the fabric