So then shutting down and restarting themes didn't disable display properties?
I wonder if you have a problem registering themeui.dll now.
When Smitfraudfix is run it kills explorer and restarts it.
When Explorer is killed, the systray icons disappear. Most come back because the programmer who wrote the program coded it so the program would recognise the crash, ir check periodically to be sure its icon was there.
This one must not be putting its icon back in the tray. If you look in Task Manager, though, the program is generally running. Closing and restarting the program manually should put the icon back. If not, try a log off and back on.