Hi ---- We've never encountered or heard of this specific problem before. Try downloading a 3D model, I just downloaded the Flying Boat model today to check it out and didn't encounter any problems. Here's the link to the page if you'd like to try this one yourself: http://www.sharecg.com/v/37031/3D-Models/Boeing-Flyingboat
If you continue to experience problems please send us an email at support@ShareCG.com with as much detail as you can and we'll see if we can help.
ShareCG Admin