I can load as many other mods into KSP 1.1x and encounter no issues, but the moment I add Mechjeb i get a reflectiontyploadexception, and the game refuses to load to main menu. I have tried loading with no other mods except Mechjeb, to the same result. I have also tried older versions of both Mechjeb and Kerbal Space Program, also with the same result every time. I was wondering if this is a common issue, and if there are any know workarounds. Not that the game is unplayable without it, but the convenience of not having to manually calculate planetary transfers in invaluable

You need to provide a log. You are not the first to report this and each time the problem was actually in an other mod but MJ code made it more obvious.

I will share a log tonight, I'm away from my computer at the moment

KSP.log

There you go
sorry for the delay. I found a couple .dlls that were broken, but in the console it just says "list of broken dlls:" and then there isnt a line after that

The GroundConstruction.dll in NearFutureElectrical is breaking something.

^that dll does not belong there.

thank you a whole lot. looks like the ScanSat mod was causing interference too