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