Hello, I am running KSP on Steam, 64 bit Windows, completely vanilla, no mods. The game was running fine last night. When I started it up this morning, I loaded my saved game and was met with a barrage of "Craft Loading Error"s at the Space Center screen. The messages read "[Craft name] was not loaded because it had the following parts missing: [part name]". I didn't read them carefully because at the time, I just thought it was some funny little indie game bug, nothing to be concerned about. There were a dozen or more of them. I closed them all out and went to the Tracking Station. All of my ships were gone. I had about a dozen vehicles all around the solar system and none of them were showing up in the Tracking Station. Rockets, bases, space labs, everything gone. When I tried loading a vehicle in the VAB, all of my ships had ***Contains locked or invalid parts*** errors below their names. Loading one of them gives the following message: [indent]Craft Loading Error Craft Clipper 1.0 was not loaded because it had the following parts missing: fuelTankSmallFlat fuelLine RCSBlock batteryPack sensorThermometer fueltank3-2 engineLargeSkipper fuelTank2-1 Size2LFB liquidEngine1-2 I checked my research tree, and it's just the same as it was last night. Any ideas?