Running SolidWorks Premium 2012, Windows 7. I can successfully run a Flow Express analysis on a simple part without issue. Once the analysis is finished and I close the analysis session, if I make changes to the model and start a new Flow Express session SolidWorks crashes hard with a request to send info regarding the crash. I have tried this multiple models to verify that its not a corrupted model issue. I can perform a "save as copy" function and launch Flow Express on the copy will still cause a crash. I can save a copy of a new model BEFORE running the simulation and then after the crash open the copy I saved BEFORE running the simulation and Flow Express will run successfully.