Hi Martin,
Once I renamed the structural model, it allowed me to open our model. I will
log this issue with Product Support as you suggested.
FYI, in further testing I was able to get the structural model to work. Once
the model is linked, in the Visibility Graphics under Revit Links when I
changed the display setting from By host view to By linked view I received
the error message "To allow fill colors to display properly, the view has
been switched to hidden line mode". Then I changed the display setting from
By linked view to Custom and change the "Color fill" drop-down from
linked view> to and all works fine.
Thanks for your help,
Dennis