Open a code window that has enough code to fill the page full screen-tabbed. Then switch to a window that only fills half or less of the page (full screen-tabbed), and I can see the code from the previous page at the end of the code from the short page. Scrolling confirms the page is fully loaded. Going to a different view scale, or full screen cleans up the page. Very annoying. I think it may have something to do with the page previewer. Swapping to another page and back to the small page does not fix the overlaying code.