I was getting used to seeing all my schematic pages shown on my ProjectNavigator Tree. Now when I open my design I see Design Root > schematic name but there are no schematic pages listed below. Now there is a red X through my schematic name. If I click on the schematic name with the red x, it opens my 1st schematic page and I can still see all my pages using goto or page up and page down but nothing but none of the schematic pages show up in the ProjectNavigator tree. Can you help me correct this?
Run "Check Project" and fix any errors until the red X goes away. The red X indicates that the netlist (wir files) cannot be loaded, this is usually a problem that will be found by "check"