Lost Wiki calendars after upgrade to 10.6.4

Hi,

After upgrade my clients to 10.6.4 we are not be able to connect to our Wiki calendars using iCal client.

The original path was:
/principals/wikis/WIKI-NAME/
But now it says the client is not able to connect to:
/principals/ _uids_/8a8be0fd-f969-5760-bef6-a73ad4ae3aa1/

If we recreate the subscription, the first time iCal is able to access to the calendar data, using the original path, but after close and restart the client, it modifies the path and uses the new path value (/principals/ _uids_/8a8be0fd-f969-5760-bef6-a73ad4ae3aa1/)
In the caldavd error log says:

[AMP,client] [twistedcaldav.directory.principal#error] No principal found for UID: 8a8be0fd-f969-5760-bef6-a73ad4ae3aa1

We do not have this kind of problems with our Leopard (10.5.8) iCal clients or using the web page.

Thanks in advance for any help.

H.