now dual monitor support is working for me, I start playing with it and found some issues.
i open a folder in the xnview browser and start fullscreenview on my secondary display. now i use the "page up/down" keys to cycle trough the pictures >> works perfectly.
if i switch folders to view another photoset (still fullscreen on secondary display) and try to use "page up/down" keys it won't cycle trough the images correctly. same happens when i use the mouse to select a picture an want to "page up/down" from this pic.
beside that i get a minor graphical corruption in the folder-tree-view, while doing fullscreenview on my secondary display (a grey bar in the first line).
i hope it's not too confusing

XnView 1.80 <x>