I recently exported a native SolidWorks file using the SAVE AS, ProE part option. I can initially open the file in Pro/ENGINEER without any problems...until I regenerate the model. Once a regeneration is performed, the geometry disappears from the screen. I have tried STEP files and other neutral files, and they all seem to work fine. I have verified that my FeatureWorks option is active. Has anyone else run into this type of problem? If so, have you been able to fix it? If so, how. I am running SolidWorks 2008, SP 4.0.