F17 lxde netinstall missing app icons

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http://forums.fedoraforum.org – I did a net install of f17 with lxde desktop today, everything went well, after installing the system I logged in and installed 2 applications: firefox and gparted. But neither of them show icons in the menu. I changed them manually but the real problem came when I tried to configure network manager. the "nm-applet" does not start because of "Icon 'nm-signal-100' not present in theme" error. I checked /usr/share/icons all the themes and icon folders are there, and I also installed the lxde-icon-theme package as well as the default theme package, whats the solution here? (HowTos)