When I open a schematic in Project Navigator I cannot see any image in the work space.
This can occur with schematic design source files, or RTL and Technology view schematics. It has also occurred when I was re-docking a floating schematic window.
The problem is caused by an inconsistency in the Zoom-Full feature of the Schematic Editor/Viewer.
You can circumvent this problem by initiating any action that adjusts the schematic view, such as clicking the Zoom In or Zoom Out button in the Project Navigator toolbar.
This issue is resolved in the ISE 10 software release.