PCB Designer Pro 17.4 crashes when I try to open 3D Canvas

I have created a simple design in OrCAD PCB Editor Professional 17.4. When I try to open 3D Canvas the tool crashes. I have tried reducing the 3D Canvas settings to no avail.

I did not create this design from scratch - I started with an existing design and made significant changes. Perhaps something leftover from the original design is creating a conflict of some sort.

Any suggestions? This is blocking my project.

Thanks - Jason