Here's an amusing...well, I'm not even sure if it's a bug or if it's just me being dumb. Building a rocket and putting two interstage fairing bases, facing each other, around my fusion reactor & magnetic nozzle (from the KSP Interstellar mod). I put on the first set of fairings, attached to the bottom ring, just fine. Then I put on the top set, where the height is adjusted so they end up overlapping the bottom set a little... As far as I can tell the two sets of fairings which are now overlapping are trying to out-fairing each other. They started expanding like a balloon around the rocket, finally filling up the VAB entirely and taking the mass of my rocket into the millions of tons. Fortunately the game did not crash and I was able to remove the top set with ctrl-z. Trying to find where the game put my screenshots of the incident...ah, here we go. So far, so good. Um... I think we're gonna need a bigger VAB. Incident replicated with a cutaway view. Anyone for space pancakes? I'll get the space maple syrup.