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Hi Alex
1. Windows
2. I confirmed those settings are correct.
I may have actually figured out a clue here.  When I start FastRawViewer, I actually get the behavior you were describing.  With Keep zoom ratio and Fit to Window set it automatically displays the full image when switching from horizontal to vertical aspect ratio images.
Here's the catch.  If I zoom in on an image and then zoom back out to the whole screen, it stops displaying the full image when I switch to the next image and maintains the zoom ratio.  I don't know if this matters, but I have remapped the Zoom In and Zoom Out buttons to the mouse scroll wheel.