[CalendarServer-users] Restarting the server results in invalid UUIDs?

Hi, I've just encountered a new problem using Calendar Server 2.4 on Fedora 13 - adding CalDAV calendar(s) works from iCal and an iPhone, but after restarting the server things start to break down: ********** The server responded with an error. The calendar http://f13.box:8008/principals/__uids__/d817aaec-7d24-5b38-bc2f-6369da72cdd9... was not found on the server. Make sure the URL is correct. ********** (f13.box is an alias I have for my F13 virtual machine in /etc/hosts) Removing the calendar account and re-adding it (on either the iPhone or iCal) with the exact same details will make it work again until the server restarts. Is this a bug, or a misconfiguration on my part? Thanks in advance! Regards, Stewart