The files weren't sorted naturally, so files would go like this: 1, 10, 11, 2, 21, 22. I fixed it... I think? (v1.1.1)
I also added "next" and "previous" commands that switches the images in all open SVI panels. (v1.1.0)
Commands can be bound to keys and I myself use Ctrl+Shift+Left and Ctrl+Shift+Right so I can switch the images without having to click the buttons with my mouse.