Calendar folder vanished in Kontact 4.11.2/Kolab2/Kubuntu 13.10beta

Hi all,

after having got my KMail to behave normally again (duplicated local special 
folder causing issues), I now ran into the following problem: I had just 
finished adding a new event to one of the Kolab2 user accounts in my freshly 
configured Kontact (4.11.2 under Kubuntu 13.10beta), when suddenly *all* 
events vanished from that particular calendar. When I had a look at the list 
of calendars in the lower left hand corner of "Calendar" (KOrganizer), I could 
see the three Kolab2 accounts being displayed - however, the one I just added 
an event to was missing the "Calendar" entry. Only "Tasks" and "Journal" were 
visible. The two other accounts were still complete.

I then went on a wild goose chase to get the Calendar back:
- Verified the existence of the actual IMAP folder using another mail program: 
Yup, folder is still here and still contains the event mails
- Checked "Serverside subscription" and "Local subscription": Yup, folder was 
still subscribed.
- Unsubscribed and re-subscribed folder: No change
- Fired up akonadiconsole -> Browser tab: Indeed, there's a Calendar folder in 
the corresponding IMAP collection (but Kontact does not display it in the 
folder list), but not in the corresponding Kolab collection
- Created a new folder, copied all events over and used Folder properties to 
make it a Calendar folder: No change, the new folder does not show up, the 
calendar stays empty.
- In "Calendar" (KOrganizer), right click on the resource in question -> Add 
Calendar Folder: Nope, does not get created.
- Verified on the IMAP server that I actually have all permissions on the 
inbox as well as on Calendar: Yup, still ok.
- In akonadiconsole -> Agents tab -> Kolab agent -> Configure natively -> 
Create Kolab folders for that account: Nope, nothing happening.
- Tried "Clearing Akonadi cache" on inbox, Calendar folder and a few others: 
No change.
- Finally getting desperate, I deleted the whole account and re-added it: 
Everything comes up fine *except* for that stupid Calendar folder.

Is there *any*body out there who can
a) help me get my calendar back
and
b) maybe has a notion as to what on earth made it vanish in the first place?

I'd be extremely grateful for any hints...

Regards,

Thomas
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