Trouble sewing fleece!! help!?

I am new to sewing but have made a few successful items: 2 baby slings with leg padding and pocket, and two easy dresses. My dilemma is that i am making a snugglie (from amy butler's book 'little stitches') and it requires fleece. I have bought and cut the fabrics (fleece and lightweight flannel) but when i tried a test swatch, the thread would always become bunched and the machine (brother cs-6000) would bleep and flash E6. I have tried:- using heavy thread, -light thread, - ballpoint needles (size 80) and various needle sizes up to 110.-tried lowering the feed dogs and guiding the fabrics through but it always jams up in the beginning and is impossible around corners on a bias. i have the walking foot on already and use a regular stitch, a stretch stitch, a zigzag stitch, and a quilting zigzag stitch. The fleece isn't even very thick! I am at my wits end... i know this has to be possible and with my machine too. Everything i try end up with thread all tangled an bunched with what looks like 10 strands of thread when i pull out the jam from the machine... it eventually can be untangled into the original two strands. I thought maybe it had something to do with the bobbin thread being low, so i wound up a fresh bobbin and still no luck. What is going on here!!!!!??