Editing a repeating show

Once a repeating show plays for the first time, the original date is greyed out whenever you try to edit any instances of that show. For example, if the show begins on 7/2/2012 and you try to edit the show on 7/5/2012, the start date is greyed out and unchangeable. This means you always get the "cannot create a show in the past" error and will need to delete every show and recreate it.