I am having problems with my bobbins....

When I wind on the monofilament line ( clear thread) it winds smoothly and easily. But, when I try to remove the bobbin, from the winder( on the machin), it wont budge. I have tried loading smaller amts in stead of a full bobbin (I'm useing this thread on a already started originially used an older machine was used to start it,, and had NO problem with it. ) I have tried as little as loading a 1/3 of a bobbin ( for a large quilt... this would take forever to get done if that all I can load on to a bobbin) but I still could not the bobbin off.. I emailed Brother and they basically told me.. we dont use that tread to test but heres a chart to show u about the wt of fabrics..( I guess this made them feel like they had done something) I do not have this problem with any of my other threads!! HELP!!