@tekkenlord: on what system do you run inkscape? Do you have installed the oxygen icon set, so do you have the folder 'usr/share/icons/oxygen' with icons in it?
I guess the problem is, that gtk/qtcurve fallback works only with icon sets installed in '/usr/share/icons/*' and do not look for icons in the users home folder.
@tekkenlord: on what system do you run inkscape? Do you have installed the oxygen icon set, so do you have the folder 'usr/share/ icons/oxygen' with icons in it?
I guess the problem is, that gtk/qtcurve fallback works only with icon sets installed in '/usr/share/ icons/* ' and do not look for icons in the users home folder.