I just rebooted my server and restarted squid and several consecutive entries like this appeared in my store.log:
<snip> 1076992457.790 RELEASE -1 FFFFFFFF CE8669ED92F5F708F87752CD9666DFAF ? ? ? ? ?/? ?/? ? ? <snip> What does this mean? Has something been purged from the cache? Thanks, Murrah Boswell