One test I have conducted is to load the swf and wait 20 seconds with out using any navigation (paused on the first slide) and then navigating towards the last few slides. This works fine. The screen is rendered in full and the pause on my button works fine. it is only if I jump to the later slides within that 20 second window that the render fails and the pause action is skipped.
Is this in line with the issue you are referring to?
