Kerbal Space Program

I have been encountering this weird bug which occurs when I load a craft and revert to SPH firstly almost all icons and models are gone but goes back to normal when exiting out to the Space Center and going back in, but the strange part is that fuel flow is disabled so is air flow (although monoprop seems unaffected) so basically all my rockets and jets are useless. The only fix that I've found is to quit and restart, I've also tried verifying the game cache via Steam and I have even tried backing everything up, moving it somewhere else on my hard drive, reinstalling the game and then loaded one of my saves but it still happens. Some help would be greatly appreciated.