pdxmph, I'm sorry for the trouble this is causing - the shapes in that stencil are all saved as PDFs, and they're fairly complex shapes. We suspect that the iPad is running out of memory when it tries to render them all.
This isn't something we were aware of, so I'll write this up for the team to have a look at. In the meantime, I re-saved the shapes as PNG bitmaps instead of PDFs and made a new stencil.
You can grab it from
this link.