Group calendars on 10.6.4 client machines no longer work with iCal Server

After updating 2 client machines to 10.6.4 I realized my group calendars no longer work in iCal.
I get "Server Responded With an Error" on all my group calendars, on both machines.
Preferences>Accounts>Server Path reveles the server path has reverted back to a GUID "/principals/_uids_/GUID string/" .
I change it back to "/principals/_uids_/wiki-GroupName/" and get it working again, but if I quit iCal and restart it again reverts back to the GUID.
I've trashed all calendars in ~/Library/Calendars, and the Prefs. I also tried "/principals/wikis/GroupName/", but again it reverts.
I booted to my 10.6.3 clone and have no problems with the group calendars there.
(I'm running 10.6.4 Server)
Is anyone else having this issue?
Any ideas?

Are you asking for an example of how to use calendarservermanageprincipals? While the tool is designed to help you configure privileges on resources and locations, it works fine for users. So I created a new user in Workgroup Manager to represent my Marketing department's calendars. I named this user "sharedmarketing".
Then, I wanted to give staff read-only access to the calendar and give Marketing write access, so I executed these two commands:
sudo calendarservermanageprincipals --add-write-proxy groups:marketing users:sharedmarketing
sudo calendarservermanageprincipals --add-read-proxy groups:staff users:sharedmarketing
I then imported the content from the Marketing Wiki calendar into this calendar and that was it!
If I logged in directly to the sharedmarketing account (not necessary), and looked how the account was set to be delegated, it properly showed group names:
There is no way to configure it like this using the iCal GUI, and this was I always felt that the management of privileges was the biggest obstacle in setting up iCal Server in this proper, supported fashion.
Then, from the client, I can naturally access those group calendars:
This is SO much easier to setup and maintain as each user only needs to have their ONE iCal account configured and they can just add the necessary groups, which is WAY easier than supplying users with crazy wiki-calendar URLs.

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