[Owncloud] Can't sync calendars with iOS

[Advrk Aplmrkt]

Hello,
I am using latest git ownCloud, and tried setting up CalDAV calendar
sync with my iPhone 3GS running latest iOS 5.
In the iOS settings app, I tried adding a CalDAV account either with
the calendar's address OR the CalDAV address from the ownCloud
settings page. In both cases, authentication seemed to work, but the
iOS calendar app says "no calendars".
Is there a way to fix this? Calendar sync via CalDAV is one of the
killer features that I will need in ownCloud.
Thanks!