Just changed from 2015 to 2017 version of Showcase. Has anybody an idea why I can no more import / open any STL, STEP etc.? Inventor Files work fine also with big assemblies. For testing also opened an old a3s where I knew there is an imported STL inside. Even this is not working... Error message shows only the "no units" failure. No chance to define the units and then click convert. Thanks for any feedback.