We installed Appointments+ in a premium theme called Dixit

We installed Appointments+ in a premium theme called Dixit from Themeforest. When we activate the plugin the theme is not working correctly because it can not load the correct theme settings. Also the menu item in Admin is strange. See here: http://s24.postimg.org/tkv44vna9/Screen_Shot_2013_05_28_at_13_29_24.png

Thank you