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Shrinkage can lead to spinning in the bowl. I use A container a bit smaller than the puck and shave the puck to a jam fit. I save bits of the previous puck to jam in the space between puck of MWF...

To hazard a guess, it is mold. Mold will grow on almost anything organic that is somewhat moist. Was it stored in a container with a tight lid or in a humid location? My MWF is stored in an open...