Well, this is embarrassing.
ONE DAY after releasing version 3.4 of my Cartan Node Library, I discovered a bug in one of my nodes: scale_true.
It turns out scale_true can sometimes screw up the fill color of shapes when it scales them. The bug has been fixed.
Attached is v3.5 of the scale_true node. You may want to copy paste that into the library I just released (replacing the old node).
Sorry about that,
John