Bugs with Optimizer ??

Optimizer 1.3.1

OS -Information : Windows 2000 service pack 2
Visual Studio 6.0 service pack 5

After toggling wireframe mode several times (four times at
least) when using sample applications like opviewer or
opoptimize with a .csb or .wrl file, the application
crashes because it tries to read at 0x00000000. The Visual
Studio debugger find an error in cosmo3d13.dll.

So what’s wrong ??