I use Autodesk inventor professional 2014. I design my gears using the design accelerator. However, whenever I create gear trains, parts of certain gears become transparent. This seems completely random because sometimes if I zoom in or out or when I pan or orbit, the gears look normal again. I have experienced this problem using both the default and other material types. I also have ensured that each of these gears are enabled.
Here are some example pictures Any help or suggestions will be greatly appreciated.