...and toggle all the options ON and do a 'Select All' and press MB2. You can ignore items like 'Sheet Boundaries', but pay attention 'Self-Intersection' and 'Consistency' in particular.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Sounds like it's time to call GTAC and have them look at the file. They have tools which will dig deeper into the "ones & zeros" to see what might the issue be with your model.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA