iCal Server error

Hello Helpful People

I have Lion Server and Lion Macs up-to-date.

I have Network Users with MobileHome syncing on every session. Works beatifully, now. So i Thought... let's introduce the iCal Server.

The users own calendar works fine. So I configured the Group Calendar via Wiki. I shared the Group Calendar with the Users of the Group.

It works. Everybody sees their own and their group calendars.

All the problem start as soon as we try to set up events.

1. All new events are generated as all day. Why?
2. If the new event is generated within the Group Calendar it cannot be moved to the personal one. It looks like a permissions problem. But it is allowed to move the event to one's own iCloud and then back to any Server Calendar, be it the personal or the group one.
3. If I try to generate/modify a Group event to add attendees within the OD & Group Users i get an error. As soon as I hit 'send' a window pops up offering to either 'Go Offline' or 'Revert to server'. Upon the latter the Event is lost! Why? Even via the https Web interface the scheduling of events with attendees does not work. The page starts a sunflower clock, saying it is communicating with the server and never stops.

Any Help?