There have been times on my FC6 that this happens, if after ten minutes it is still in that state, I usually re-boot to get it working properly, without re-boot, it will do that time & time again. On my system, it appears to be a screen saver issue probably due to nvidia graphics card drivers. Since applying last kernel update 2.6.19-1.2895.fc6 and corresponding nvidia & X11-xorg-drv, the problem appears to not happen any more. But I have seen the scan take as long as ten minutes (more or less) and it eventually produced a list. Sometimes depends if something else is using resources like surfing on the web at the same time.
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