AT_Utils VS KML

Find out what mod needs them, and the dependencies, that's a missing dependency most likely. redownload USI tools, and the USI core perhaps. It needs the community resource pack, and the community category kit, Individual USI modules like the Kolonization may need something else, check each mods dependencies that are clued in to you via errors. AT_Utils could be part of Configurable containers, or another of Tauri's mods, I think this is a library of all of them sort of combined. Find out what installed it. Perhaps try updating or adding it from the Github if you dont have it or have an old build.

Ty for the response! I checked the crossfeed and both were enabled, though you are totally right that that is typically the cause - I managed to fix it by running KML and fixing some root issues that staging after docking had caused.

It's called [KML](https://github.com/my-th-os/KML/releases) persistence file editor, but it'll work on any sfs I think. Just be sure to backup what you have before you save over it. When it reads mine, it is chock full of warnings about parts not being fully attached -- I'm guessing this is the morphing/clipping thing that happens with robotic parts. I haven't bothered telling it to fix any of that. In one instance, it found some errors in the file and gave me a chance to fix it, which caused a number of bugs to magically go away (kerbals poofed back into existence and so forth).

KML (Kerbal Markup lister) has a few things, one being 'refill resources'. Handy for testing or cheating I don't judge.