Black Dragon Update 3.9.10 addresses the blurry scaling issue when "Constrain Proportions" is ticked while taking snapshots higher than your window resolution ~ VIRTUALITY

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Black Dragon viewer updated to version 3.9.10 and fixes the blurry resizing issue when “Constrain Proportions” is checked while taking snapshots higher than the window resolution.
We’ll go over what this is all about in a moment.
I’ll add some of the important new features in this release and that was posted by Niran on the Black Dragon Viewer blog.

The new status bar buttons have had a few fixes, all camera buttons should now work and in addition to that, there is no a Camera Roll button whenever your camera is not leveled, finally a way to reset the camera roll with a simple click.
As per suggestion Windlights can now be put into the favorites bar (but don’t complain at me for it opening the editor, the favorites bar executes whatever is the default behavior of the item you put into it), a new option to turn off impostor generation has been added (it’s only a debug option so far because unless I make it immediately derender impostors I didn’t feel like its worth a setting in preferences, yet), the taskbar flashing when you receive an IM can now be toggled off (wow that was annoying… especially with autohiding taskbar), the Item Properties tab in inventory now finally uses SLURL’s for creator and owner making it easier to get ahold of them and the option to upload disk snapshots directly to inventory as well while saving them.
Also, a bunch of reported bugs has been squashed, including wearable body parts not replacing when double-clicking them, issues with getting disconnected towards the “precaching” phase on login due to extended unresponsive times, snapshots to inventory not being cropped anymore (its an option now), BOM allowing local textures to be used, Animesh showing empty complexity information and the onscreen controls not scaling with zoom factors like the keyboard and mouse controls do.
Other noteworthy changes are the snapshot window now scaling with the snapshot aspect ratio (without having to change the window aspect ratio), the ability to save 1024×1024 inventory textures directly, and a new feature to flip poses in the Poser. Bear in mind that the snapshot window has been ripped entirely apart and duct-taped back together because it was a huge scattered mess that made working with it hard and unnecessarily complicated (or outright impossible without workarounds), to fix this I had to essentially rip it into pieces and stitch it back together removing all the bridges, duplicate code, hacks, and workarounds, it MIGHT be that something is not entirely working as before but overall the snapshot window seemed to work fine if you find any weird behavior though report it as usual.
NIran, from the Black Dragon Viewer’s blog

Ok, now we need to update. Keep in mind that you don’t need a clean install every time you update to a new release.