Principia highly non-functional (returns to stock orbits and physics) after third or forth craft spawning (existing crafts work fine)

[magicboss812]

Version: Principia version 2026031901-Legendre-0-gefc196845b9bf666578571e0142dd1c044cfa872
OS: Windows 10

modlist.txt

ERROR.20260418-232934.16592.log

INFO.20260418-232934.16592.log

As in the image shown (currently stationary on ksc), when launching OR selecting any craft in the tracking station and piloting it, Principia's "whole" function just stops working at all, stock orbits reappear, plotting frames are stuck to the "earth centered" mode and changing it changes nothing (because there are literally stock orbits, fully functional).

I could swear, I could just make a mun transfer, as there were literally only stock orbits, like the mod was just for the UI

But this image instead shows, that in the tracking station, I can select the crafts and their principia orbit appear normally. But when I select that one craft, that I got into orbit now (with principia not working at all at that time), then I get stock orbits again, principia just disengaging

And now, I've found out, that if I select that relay and pilot it, then principia works fine for that instance. Back into that exact craft, stock orbits again. It could be that a very specific part is causing the issues with principia

The craft.txt

But no, I've literally checked other crafts, even stock crafts. Like, everything that now spawns at the ksc will not work with principia at all, nothing that is newly spawned. And there are quite some conflicts, I don't have massive amounts of crafts right now, as this is a fresh save, and I have some long term progress already. It would be a shame to change the save. Though, I've still not tested, if this appears on new saves too.

Already tried:

• restarting ksp
• going into main menu and back
• going into ksc, then vab and lauching, or to tracking, ALL possible combinations
• deleting principia folder and reinstalling

I'm highly not sure about mods, since I can't just say I've not installed anything new recently, as my modlist is literally "everything" new since yesterday. And no, not that I don't know about incompatible mods with principia and etc.

[magicboss812]

To clarify this, because I made a mistake in the first paragraph:

Any now already launched craft, BEFORE the current issue craft, can be normally piloted, and principia works fine.

But launching a new craft: Stock physics
Now going into tracking station and selecting that newly launched craft, still gives me stock physics, on KSC AND in orbit

I have still NOT testing this on a new save, nor on a clean save with only principia