Chessehead17

ok i am confused as to whats going on. i have just went and fresh installed Kerbal Space Program and the only mod i have is this mod, i can build ships in the VAB and the SPH but when i click launch it just stops (only ships with parts from this mod), not freeze just stop. all buttons on the screen won't work and the only way to get unstuck is to alt tab. but all that does is make use of buttons available again but i can still not launch. I just feel like there is a simple fix and i am just over thing an answer. any help is appreciated. [Edit]i can load the pre built vehicles but not custom ones.