I am using Chrome on OSX and have encountered an infuriating bug which makes JSFiddle unusable:

As the screenshot shows the CSS and Result text areas are squeezed off the screen with no handle to pull them back. How can I make them visible and usable?
It hasn't always rendered like this, but I'm not sure what has caused it.
What I've tried
- Disabling all chrome extensions
 - Resizing the browser to a ridiculous width
 - Clearing local, session and cookie storage for JSFiddle on Chrome
 - Removing secondary screens
 - Changing my screen resolution
 
None of which have changed anything.
Update
The bug is not replicated when using safari.