BM36 sp2

The BM proxy has a CERN parent that require authentications. I use proxy.cfg
to do this:

[Proxy-Authorization]
UserName=xxxx
Password=yyyy
ProxyReAuthorization=1
AlwaysSendAuthorizationToCERNParent=1

All works fine. However, if users go to an HTTPS page, they are presented
with the standard IE authentication dialog which is requesting the username
and password for the CERN parent.

In proxy.cfg, I also have the lines:

[Extra Configuration]
EnableICSPassThruFix=1
TurnOffPersistantPassThru=1

Any ideas?
Cheers