I have a ComboBox that doesn\'t seem to update the SelectedItem/SelectedValue.
The ComboBox ItemsSource is bound to a property on a ViewModel class that lists a bunch
I had what at first seemed to be an identical problem, but it turned out to be due to an NHibernate/WPF compatibility issue. The problem was caused by the way WPF checks for object equality. I was able to get my stuff to work by using the object ID property in the SelectedValue and SelectedValuePath properties.
See the blog post from Chester, The WPF ComboBox - SelectedItem, SelectedValue, and SelectedValuePath with NHibernate, for details.