Disappearing stencils after close/open Diagram
 

Hi Omnigroup,
I have the latest Omnigraffle on latest iPad. I've imported the Cisco Basic stencils by email the stencil zip. the stencil imports fine, but a weird thing happens. When I create a drawing and add some Cisco icons, they disappear after the diagram is closed and re-opened. Funny thing is, the icons are actually there in that I can highlight them and their outline box and grab handles appear, just that you cannot see the icons.
Is this a bug with OG, the stencils or the stencil import process?