Upon trying to even start the Mission Editor will crash. Any tips?
Coogan
What happened to me is that after trying to convert some missions, the ME just wouldn't open anymore. I wouldn't get a crash message or anything but when I would click on it, nothing would happen. Even after removing all the mission files I was messing with, it still wouldn't work.
The only way I could get it back is to uninstall AH and then reinstall it.
If you are desperate enough to try that, you should make a back up of all your content folders, terrains, settings , skins, missions etc. Uninstall AH and then reinstall it.
Before adding your files back, see if the ME works. If it does, you could start putting some of your files back until it crashes again and maybe find out if some of your files are causing it.
Other than that, I guess you can wait for a patch or something and see if that fixes it.
I never figured out what was causing my problem, but it seems to have stopped for some reason.