iCal creates calendar account every time I open iCal -> duplicate Events

Hi,

I have a Lion Server and 2 Clients (with Lion). All the latest updates are installed on all computers.

On the Lion Server is the iCal Server running.

Ok I configured iCal on a client (Lion). This client has 2 cal accounts (in Preferences -> Accounts).

Nr.1 = WebDAV from the Lion iCal Server

Nr.2 = the iCloud accout from the client-user

Ok here is my problem:

When I start iCal on the client mac, iCal everytime ⚠ creates a duplicate iCal account of my WebDAV account. So the account Nr. 1 exists twice AND all events will be duplicated. If i wouldn't delete the new account everytime, the WebDAV-account would exist 10 times (when I start the app 10 times).

And this account will also be created when I delete ALL accounts in iCal and restart the app. This also happens when I deactivate the iCloud account on this Mac.

I also tried to delete all files in ~/Library/Calendars but this problem still exists!

This is really annoying.