1 - It seems like I have a large amount of scenes with the issue, and they're scenes I made/edited, and don't want to fix them all one at a time this way. Where would I acquire/try older nodeconstraint versions just to test?
2 - Fixed thanks to that guy who provided his plugin folder around the same time as my post. Replaced one plugin at a time until I stopped having the issue. Not sure what caused, out of sight out of mind.
3 - Fixed it
4 - Here's the scene with chikas
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I have this lighting issue in a lot of scenes, so if there's some sort of updated set of plugins/files to make lighting better, that'd probably be the best start, if you're familiar.