Edit: the latest commit just fixed things again. Ignore the rest of this. Sorry Ferram, just meant to encourage him to keep digging as he isn't alone. The best I can do as far as reproduction is just as he said. To try a little harder, I opened the gamedata folder and deleted everything but FerramAerospaceResearch, ModularFlightIntegrator, Squad, and the Module Manager files. Then I started a new game, opened the SPH and added a MK2 cockpit and some fuel tanks. Get voxelation between/inside parts and the cross section area is very low, just as shown before. Here's a log: http://pasted.co/c5822276 The only things that sticks out to me: "Part Warning: part mk2FuselageLongLFO is not a child of mk2Cockpit.Standard" and "Part Warning: part mk2FuselageLongLFO is not a child of mk2FuselageLongLFO" but I honestly don't know if that's normal or not. I think I was reading the voxel method starts with child parts and works to the parents but I really don't know. If I just copy the FerramAerospaceResearch.dll from the official newest release and replace the dev branch one, it goes back to normal. Really I don't know if I could do more than that, sorry. At least I haven't experience the no drag bug...