I am using a multiscreen setup with one small landscape screen and one big portrait screen.
When I try to open a dialog like the Inkscape settings or the document settings in Inkscape, it does not open. Or more precisely, I cannot see it because it is positioned outside the visible area. I have this problem with current Inkscape 0.48.4 on Windows 7 Professional 64bit.
The bug is known for some time but unfortunately not fixed.
But I found a great and easy workaround which I want to share with you here: Whenever you cannot see a window because it is offscreen, press [Windows-Key] [arrow-up-key]. This shortcut maximizes the current window and you can use it normally. This probably only works on Windows 7 and newer.
You can also use the left or right arrow-key to position the window on the left or right half of the screen.
Happy drawing! 🙂