Hi MrsBoats,
I too have a Pfaff - YES!!! my girl can be a bit of a problem too. I have found that sometimes Gutterman is the problem. You need to make sure that your Gutterman is NOT from Mexico. If so you will have problems (I use it is my OLD machine and it works fine, but not in the Pfaffs). I have found that sometimes the Gutterman is not put on the spool the same way. I don't know if Gutterman has had problems with tension, but I have found over the last few months it has come off with a twist (so it brakes and brakes and brakes - YES about every 10 stitches). I have found that if I slow down and watch my spool - when it starts to come off with a twist - I will hold onto the thread to keep tension on it without braking. The other thing my Pfaff likes is Sulky. I have also been know to wind bobbins and then put a bobbin on my top as well as bottom (looks dumb - but it works). The other thing that happens with Pfaffs - is you might also have a burr. Good luck!!!
Snooks