I did mean to say "jjPalette.apply()". But it doesn't matter much, either way it hangs on the apply() method in the jjPAL class.
I've found the line of code that causes this. Let's see what we can do about it.
EDIT: For now, a workaround to avoid the problem is to use 8-bit color mode in problematic levels. This way you can continue building your level while we prepare a patch
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