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Three things really and in your case the items related to Linux Security are 0 and 1:
0. you should upgrade FC6 to F7 to F8 real soon. AFAIK FC6 is off the support list,
1. you should not use any services as root account user,
2. there is no output shown so we don't know what or how you use whatever it is you use.
When I'm logged in as root, xscreensaver won't lock my screen!
Don't log in as root.
Please note that xscreensaver works fine as a screen saver when you are logged in as root: it will not, however, lock your screen when you are logged in as root. This is for good and insurmountable security reasons.
In order for it to be safe for xscreensaver to be launched by xdm, certain precautions had to be taken, among them that xscreensaver never runs as root. In particular, if it is launched as root (as xdm is likely to do), xscreensaver will disavow its privileges, and switch itself to a safe user id (such as "nobody".)
An implication of this is that if you log in as root on the console, xscreensaver will refuse to lock the screen (because it can't tell the difference between root being logged in on the console, and a normal user being logged in on the console but xscreensaver having been launched by the xdm "Xsetup" file.)
The solution to this is simple: you shouldn't be logging in on the console as root in the first place! (What, are you crazy or something?)
Proper Unix hygiene dictates that you should log in as yourself, and su to root as necessary. People who spend their day logged in as root are just begging for disaster.
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lock root user
