Tue Aug 09, 2016 9:21 pm by bob
idk really understand what your issue is anymore (or at least I thought I did, now I don't). Sometimes a picture is worth a thousand words, as the saying goes.
That said, I can only re-iterate what I've already said.
The source and the viewer box should be the same aspect ratio, i.e. 16:9 or 4:3 or 27:3 or whatever. Whatever aspect ratio your source is, your viewer should be the same. Whether the viewer is smaller or bigger (in pixels) than the source does not matter, as the view should be scaled to fit. It is the aspect ratio of the sizes of the source and the viewer which matter. i.e. your source could be 2560x1200 and the viewer could be 853x400, which is the same aspect ratio of 32:15 for both windows. The viewer should display the source quite nicely within this, and it would be a scaled down view.
The only other thing that jumps to my mind that might be causing you grief is perhaps your window layout is forcing the dxnothing to display incorrectly, because your dxnothing is in a swap group which has a reset region of a different size to the dxnothing window ? DXnothing usually needs to be in a swap group with no reset region specified (whether its own group or a communal one).