Installed MechJeb, couldn't click "Resume Saved Game", uninstalled, still same issue

[ErasmoGnome]

So I was playing fine earlier today, but was getting bored of flying up the same rockets over and over again, so I decided to try out this MechJeb thing I'd heard so much about. I downloaded it, and stupidly just copy/pasted the three subfolders (Icons, etc) into GameData separately, instead of copying the folder. I booted up KSP, and it said MechJeb had been installed incorrectly. A quick Google search later and I was hitting myself, and I deleted those three folders, then copy/pasted in the folder "MechJeb2" from my downloads into GameData, with those three folders installed.

The game then booted up fine, and I went to hit "Resume Saved Game", and absolutely nothing happened. It just doesn't do anything (starting a new game works fine). OK, I thought, let's just uninstall the bugger. So I deleted the MechJeb2 folder, and booted up the game again - exact same problem. I can't even get to the menu of current games.

I like my saved games, and want to play them more. Do you guys have any tips on how to fix this? Thanks.