This glitch is a game breaking graphical glitch which causes the KSC to become unusable.
How to do the glitch Edit
To do the glitch,you must go faster than the speed of light or FTL for this glitch to work, most probably through a modded part or through a mod called HyperEdit. Once you go fast enough, the ship will disappear in a puff of smoke. Now if you return to the Kerbal Space Center KSC, the glitch will occur. If you move the camera, REALLY glitched up terrain will flash around the screen. At the moment this glitch is only confirmed in 0.23.5.
Why it works Edit
I believe it as a programming error
Nexter's Lab's video on YouTube