A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Ok, so not a bug. Still, a very poor design, in my opinion.
There is no reason to permanently hide the guides, especially when the guide is moved to the page edge. For example, if you have a bitmap object on a slide which exceeds the page dimensions and you want to draw something over top of the bitmap without going past the page edge, the guides would be extremely helpful to have.
What is wrong with requiring people to just press Alt-F9 again to hide the guides?