selinux advises restorecon unknown?

I just installed FC8 x86_64 on a Dell Precision T5400. I then installed nmap. I ran nmap. SELinux signalled that something was wrong. I looked in the log, then I ran sealert -l 47<blah-blah-blah> and it advises me to "try to restore the default system file context for <Unknown>, restorecon -v <Unknown>". a) What should I do? I am guessing # touch /.autorelabel # shutdown -r now b) is this a bug? I googled (selinux "restorecon -v unknown" bugzilla fedora). Lots of hits, no general solution I could find. Many with similar problems eventually figure out which file actually is causing selinux unhappiness, but I have no clue how they figured it out. Anyone spare a clue? Dave side note - after that I ran yum -y update, the screen has gone black and does not respond to anything, including cntl-alt-del or cntl-alt-backspace. No fair!