Dopus 13 .10 x64
Lister columns for picture metadata (such as Aperture and Shutter speed) remain empty even when the images listed are displayed in the Viewer and F10 shows all the metadata that's available.
(I've found nothing when searching for this here or in the helpfiles.)
In the listers, Shutter Speed and Aperture columns are empty, but Focal Length and Exposure Time columns are good. In the Viewer's F10 overlay, these missing values are correctly shown (albeit with Aperture being called F-Number, which is fine).
Dopus knows the values but isn't displaying them in the listers.
Aperture and F-Number are different things (F-Number is the ratio of the aperture to the focal length). Shutter Speed and Exposure Time refer to the same thing but are distinct metadata fields, so Opus shows them both (if both are stored in the image).