Wiki plugin - I'm unable to use the visual editor in the front end.

I'm unable to switch between the text and visual editors when editing a wiki. In the console, I'm getting this error:
Uncaught ReferenceError: switchEditors is not defined

I've tried the following with no luck:
- Checking and unchecking the 'Disable visual editor..." box in my user settings

- Disabling all other plugins

- Installing 'Use Google Libraries' plugin, rebooting, etc.

- Opening in another browser

Any other ideas?