I have been having this glitch with the slim shuttle stock craft (and other craft) where the KSC becomes an island not like danny2462's glitch were the KSC becomes the only thing on Kerbin in my case the land is still there but its cut out were the KSC is so the KSC becomes an island and when I try to land on the runway my craft does R.U.D. If you have a fix plz let me know. this is in KSP 1.5.1 with making history installed.(don't tell me to update)