I'm getting the error about the collision box if certain mods are enabled. At first, I thought I had sorted it out to a specific mod, but it seems to be that I'm just chasing a heisenbug - every time it's a different mod.
It seems to have been that removing Schall's Circuit Groups and Schall's Transport Groups fixed it? Independently they're fine, together they break things... But only if I have Enable All Planets on.