Lock up in space plane hangar issue

Lock up in space plane hangar issue - Close-up Photography of Air Liner

When im in the hangar for space planes and have finished creating a plane, I go and press the launch button and the game locks off all of the buttons but still lets me interact with certain parts of the plane (Right click to see fuel etc..). The game stalls in the hangar and doesn't move onto the run way.

Has anyone ever had this happen and if so how have you managed to fix this issue?

P.S. I'm using Version 1.0 of KSP






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Images: Kelly, Dom Le Roy, Andrea Piacquadio, SpaceX