Bug report re Output Preview/Color Warnings/Show Overprinting

When 'Show Overprinting' is toggled on it displays the results in the selected colour on the page being viewed. However, when you navigate to the next page frequently no results are displayed. When you navigate through the rest of the document, results are sometimes displayed, often not.

The only way to get 'Show Overprinting' to display consistently and correctly is to toggle it off and back on for every single page.