When I try to view DNG files from my Samsung Galaxy, they are not displayed correctly. Another DNG file from a photo program would not display at all. Is the DNG file format supported? I am using DOPUS 13.9.
They are definitely supported. Check that you have the Raw Digital Camera plugin enabled in Preferences / Viewer / Plugins.
I have every plugin enabled except Multiview. Without the Raw Digital Camera plugin enabled it does not even recognize DNG files as pictures. The DNG files come from different places. One place is from a Samsung Galaxy phone. Another place is from my photo software. It says, "Unable to load xx as a picture" where xx is the file name on the one DNG from my photo program. On the 28 from my phone it just shows a box with a larger top area that is all black and 6 little squares along the bottom that are strange colors but MAY be representations of what the picture looked like.
If you zip a couple of them we can take a look.
I can do that, I think this is the way to upload a ZIP file.
DopusDNG.zip (41.2 MB)
The first three display OK if you configure the Raw plugin to do a full decode instead of using the embedded preview/thumbnail.
(To get similar colors to what Photoshop displays, I also had to change the White Balance setting to one of the "Camera Specified" options, else it looks much warmer than it seems it's meant to.)
If you drag one of the images on to the list of cameras on the left of the plugin's config window, you can set up a profile for just that camera, to avoid changing settings for all cameras.
It looks like those first three files don't have embedded thumbnails, but the version of LibRaw we're using (also the one File Explorer uses) misinterprets them and displays some other bitmap data inside the files as the thumbnails.
Updating to the latest (pre-release) LibRaw code seems to fix that, so that it knows there's no thumbnail and automatically does a full decode. So the above won't be needed once we release a version with the newer LibRaw code. (That said, you'll probably still want to change the White Balance setting for that camera model.)
For the fourth image, I'm not sure what's going on with that exactly. LibRaw seems to reject the file as one it doesn't know how to handle, even with the latest code. More detail about what created the file might explain what's happening; it could be an obscure DNG type that we don't enable at compile time, maybe.
I changed the settings screen to look exactly like yours. The one picture that is different (waterfall girl) now displays correctly! 
The others (which came from the phone which is now shown in that settings screen - just like in your example) also display correctly.
THANK YOU!
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FWIW, waterfallgirlf.dng only shows a thumbnail for me, if restricting things to only use Opus's raw plugin.
If Preferences / Viewer / Viewer Pane / Display shell thumbnails is turned on and Microsoft's raw handler is also installed, then the image shows OK in the preview pane, but it's coming via the Windows shell rather than our plugin. That might be why that file works for you (and me, now I've turned that option back on!). You can tell if that's happening by what it says after the filename above the viewer pane:
I see that now. I don't want the MS raw handler so I disabled it. I have other programs that can view the file. When you include the new version of LibRaw it will start working again. I don't use DNG much, and when I do it is from my phone - which IS working, now. In fact the only DNG I have in that folder (other than photos from my phone) is the one I sent you.