I tried both 0.7.2 and 0.7.3 and I get a UI lockup for the Launch and Leave buttons in the VAB / SPH. I made a fresh install of KSP and also have no other mods.
Edit: I think I found the problem. I put my mods in a Mods subfolder in GameData, but the settings.cfg file lookup is hardcoded to a specific subfolder within GameData. When I moved the mod back to GameData, everything started behaving like expected.