DO13 (and 12) is incompatible with ACDSee PicaView's context menu picture preview display. When using Windows' own File Explorer, the thumbnail is shown as a menu item, but the item is shown blank when using DO. I tried a lot of other apps that support the shell context menu, DO is the only one with this problem.
ACDSee PicaView is included in their ACDSee product. This problem is reproducible in any edition.
File Explorer:
DO: