squid 2.6.9 is out and it fixes some major bugs: http://www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE9-RELEASENOTES.html Key changes squid-2.6.STABLE8 to 2.6.STABLE9 * Bug #1878: If-Modified-Since broken in 2.6.STABLE8 * Bug #1877 diskd bug in storeDiskdIOCallback() * See the list of squid-2.6.STABLE9 changes and the ChangeLog file for details.
fixed in cvs.