what does the block page say? HAVP? check blacklist button
do u use dansguardian?
did u perhaps block certain protocols?
only some thoughts.
personally i run off the cd and make occasional backups of my db, that way if the machine i am using dies it is only a few moments to get the replacement runnin correctly.
We are running the system off a USB drive. We are not using Dansgaurd. The only thing we are really running is hte QoS and l7 filtering for P2P services.
We are getting no error messages on a couple of the sites, just a blank page. Bypass the ZC box and all is well.