Just an FYI here, may not actually be a bug but it can be confusing.
If you switch to a theme that is not the 'default' theme as defined in the WP administration area the display is not correct.
For example if the site wide default theme is 'Twenty Eleven' and you have selected to use a different theme when you go WP-admin -> Appearance -> Themes the site wide default theme isn't displayed correctly and often times disappears from the list of themes installed.
As I said may not be a bug but it's certainly confusing.
Would also suggest a bullet or other indicator of the default menu in the toolbar.
Great plugin, very helpful for demoing themes to clients.