Editor Crashing

[Your Computer]

Where is the LevelEditor.log? Also, I recently turned my CS into an FC. I don't use Steam or Desura.

Should be in Documents/HPL2.

I don't think a FC can ruin the level editor unless perhaps the core libraries or resources were messed with. I would probably consider backing up your stories and running the Amnesia installer again (uninstalling Amnesia first shouldn't be required unless the installer is really "picky"), then reinstalling the HPL2 suite.