Account access to specific websites not working

Question

On my daughter's computer (iBook, limited rights account) she can no longer access Facebook and a few others. (these sites work fine with admin account on this machine) Heard that fixing permissions and/or repairing the Keychain would work... Nothing working so far. Though Safari was the culprit, but behavior same in: Firefox, Camino, iCab, Chrome. (uninstalled addn'l browsers after testing)
What I've done to date:
Reset Safari and empty cache
http://forums.macrumors.com/showthread.php?t=280529
no change
Ran Keychain First Aid and verified date and time from Apple's server
http://support.apple.com/kb/TA20405
no change
matched proxy information
http://superuser.com/questions/67472/safari-cant-establish-a-secure-connection-t o-the-server
no change
repair permissions as admin, then DVD, then root
ACL found but not expected on 'private/var/root/Library/Preferences'
ACL found but not expected on 'private/var/root/Library'
ACL found but not expected on 'private/var/root'
several issues with 'permissions differ but will not be changed'
no change so far, but repair permissions from restricted account (with authorization) looks promising though I've been fooled before.
Don't want to have to nuke/rebuild the profile. I had a similar problem on my PowerBook several years ago, and APPLCARE walked me through a Terminal fix. (All my machines are out of warranty now)
Anyone else have ideas?

Answer 1

Fix permissions did NOT work, neither did booting as Single User with /sbin/fsck... Disk Utility with iBook in Target Mode reports "The volume iBook appears to be OK."