Access Denied on 2.2STABLE5 w/accel and proxy

I'm using squid to provide filtered access (squidGuard) in a K-12
environment. For historical reasons (CERN) we have squid running on
port 80. I wish we had not done this, but it's painful to change all
the clients. Anyhow, our "real" web server runs on port 81 of the same
machine. squid-1.NOVM.20 works like a champ, but I have been unable to
figure out how to move to a more modern version. I always get an "Access
Denied" error when a client tries to access the accelerated web server
on port 80. Duane and Henrik gave me some suggestions earlier, but
apparently did not use small enough words for my bear brain. Perhaps
somebody is already doing this and could ship me a cookbook. My
working squid.conf is below. TIA!

-- 
Jay Rouman  (jsr@dexter.mi.org  jsr@ais.org  NIC Handle: JSR)
System Administrator, Education Central/Edzone (jsr@edcen.ehhs.cmich.edu)
======================================================================
# Version:  squid-1.NOVM.20
#
http_port 80
#
hierarchy_stoplist cgi-bin ?
cache_stoplist cgi-bin ?
cache_swap 500
cache_dir /usr2/squid/cache
cache_access_log /usr/local/squid/logs/access.log
cache_log /usr/local/squid/logs/cache.log
cache_store_log none
#
pid_filename /var/run/squid.pid
debug_options ALL,1
redirect_program /usr/local/bin/squidGuard
redirect_children 4
#
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl all src 0.0.0.0/0.0.0.0
#
acl SSL_ports port 443 563
acl Dangerous_ports port 7 9 19
acl CONNECT method CONNECT
#
http_access deny manager !localhost
http_access deny CONNECT !SSL_ports
http_access deny Dangerous_ports
#
http_access allow  all
icp_access  allow  all
miss_access allow  all
#
cache_mgr webmaster@elpbox.mtpleasant.k12.mi.us
#
cache_effective_user info info
httpd_accel localhost 81
httpd_accel_with_proxy on
#
dns_testnames internic.net usc.edu cs.colorado.edu mit.edu yale.edu
minimum_direct_hops 4
cachemgr_passwd disable all