Thanks, that fixed it. I actually downloaded WaveFunctionP's version but like an idiot I then deleted it from the downloads folder and reinstalled the older version. Thanks Atrius for the help. And thanks WaveFunctionP for the work done on the mod.
I have the exact same issue. I checked for multiple KSPIExtensions and while i did find two the problem persisted after i deleted one. Anyone have an idea how to fix this?