3D PDF not generating

I'm trying to generate a 3D PDF of a file and it starts to create the PDF, when it gives this error message and I get the Microstation has stopped working pop-up box  [Exception encountered inside [callPlotHookMethod [OnNewModelRef]].  Has anyone else received this error message and does anyone know what might be triggering it in the file.

Thanks, Kevin

Windows 7: MS V8i  08.11.09.357