One rather annoying thing I'm seeing is that after you look up a word in the dictionary or pull up a menu or change the light setting--basically do anything that causes a small window to be overlaid on top of the text--once the overlaid window closes a large portion of the text on the page is displayed much thinner and lighter, and this isn't always just the text that had been overlaid. I can restore the text by forcing a page refresh by paging back then paging forward to redisplay the page. But this is an inconvenience. Amazon needs to force a total page refresh whenever an overlaid window closes.