Right, sorry.
We found two cases where Stacks refuse to unload:
a) with the preload function
b) if you go from a Song - say, Song 1 - to the Global Part, and then from there to a different Song than before (say, Song 2), then Stacks of Song 1 stay active. For now, try to avoid both scenarios. If you really need preload for fast switching of Parts, you may select each part with Stacks once - tedious, but it should work. Sorry for that, will fix asap.
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