Hi Ellen….probably my design mistake as many believe the WP Header feature is to load a banner, but I used that for just the background area of the banner area (widget position). To load a banner image, use a widget in the “Banner” widget position for what you are wanting to do. The WP Custom header is just for the background only. Sorry about that…a design learning experience for me.
Regarding Widgetkit….although I don’t provide support for third party plugins, what are the errors that you are getting?