I tested this on a other computer
Windows 7 ultimate 64-bit service pack 1 Basic mouse - no wacom
Inkscape 0.48.1 - Shortcut works Inskscape 0.48.4-1 - No shortcut
I tested this on a other computer
Windows 7 ultimate 64-bit service pack 1
Basic mouse - no wacom
Inkscape 0.48.1 - Shortcut works
Inskscape 0.48.4-1 - No shortcut