When Dopus window is maximized sometimes it is impossible to see the whole image using Expand and scroll in the Viewer Pane. Whether this happens or not seems to depend on the picture aspect ratio, resolution and on the zoom level set in the Viewer Pane.
As usual a video of how it happens:
The problem occurs on highres.jpg in particular, about 3-5 pixel wide part of image is out of sight.
Highres.jpg is in the attachment. highres.zip (710.3 KB)
Directory Opus 12.3.6 x64, Windows 7 x64 Sp1, 1920x1080 screen resolution.