Tested on Windows XP, Inkscape 0.48.4 and trunk revision 12832.
The shortcuts don't work when numlock is off. Thus View>Display Mode> Toggle only works when numlock is on and View>Color Display Mode>Toggle doesn't work at all. I haven't tested on Debian yet, but it looks like it's Windows specific. Anyway, the numlock issue must be fixed.
Tested on Windows XP, Inkscape 0.48.4 and trunk revision 12832.
The shortcuts don't work when numlock is off. Thus View>Display Mode> Toggle only works when numlock is on and View>Color Display Mode>Toggle doesn't work at all. I haven't tested on Debian yet, but it looks like it's Windows specific. Anyway, the numlock issue must be fixed.