In the topic you mentioned we suggested starting in safemode through Steam. Did you try that?
- In Steam, Right-click on the game title under the 'Library' and select 'Properties'.
- Under the General tab click the 'Set launch options...' button.
- Enter -safemode into the launch options and click 'OK'.
- Close the game's 'Properties' window and launch the game.
This will reset all settings.