- Have a site with 2 styles
- Disable one of the two styles (the non-default style)
- Reload page
- Click the radio button on the non-selectable, non-default style to set it as default
- Reload forum
Receive error message at step 4 - "You cannot prevent users from selecting the default style."
Default style is changed and shown to user, regardless of if it is selectable or not.