The FeatureManager design tree is there when i open the assembly, then after a few changes are made, the FeatureManager design tree goes blank. The PropertyManager tab and the ConfigurationManager tab still works just fine. And i can do anything normally possible from the model itself. If i close the assembly and open it again it's there then disappears again after making a few changes. Any ideas?
i am running SolidWorks 2010 x64 Edition SP4.0 on Windows 7