As Tom said, clear will move differently than color, opaque different than transparent. Since you are having this issue at a boundry layer AND you say it is when you reach a particular size threshold, I would agree it is a heat issue. As we start working larger projects, we may not understand the heat base needed deep inside must be increased geometrically. The outside may move the same as smaller marbles and we believe we have the same heat base when in fact we don't have enough heat. So if you are having trouble moving upward in size/scale of your projects try deep heating the core of your marble. Good luck.
Otter
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