Hi Severin,

When you first opened Calendar.app after upgrading to Mountain Lion, did you 
allow it to complete "Upgrading Calendars"?
 
I require more information on how you have Calendar.app setup & how you have 
been syncing.
The message you received when you 'Signed out of iCloud' indicates you have 
been and are using iCloud.
 
Open Calendar.app
Calendar > Preferences > Accounts  - What do you have listed here, is it 
'iCloud CalDAV'?

Under Calendars (in Side column) - what Calendars do you have selected & 
Subscriptions?

Cheers,
Ronni

On 30/07/2012, at 5:11 PM, Severin Crisp <sevcr...@westnet.com.au> wrote:

> Thanks Ronni, no rush
> Severin
> 
> On 30/07/2012, at 5:03 PM, Ronda Brown <ro...@mac.com> wrote:
> 
>> Don't sign out of iCloud then.
>> I have to rush out now to deliver and setup a new computer for a client.
>> 
>> I'll give your problem more thought when I return home.
>> 
>> Cheers,
>> Ronni
>> 
>> Sent from Ronni's iPad
>> 
>> On 30/07/2012, at 4:43 PM, Severin Crisp <sevcr...@westnet.com.au> wrote:
>> 
>>> When I do that it tells me it will delete my calendar from this Mac but 
>>> leave it available for others.  What do I put aside to restore after the 
>>> deletion?  
>>> Severin
>>> 
>>> On 30/07/2012, at 4:05 PM, Ronda Brown <ro...@mac.com> wrote:
>>> 
>>>> Hi Severin,
>>>> 
>>>> If you are NOT using iCloud;  Go to System Preferences > iCloud and 'Sign 
>>>> Out'
>>>> See if that stops the "Upgrading Calendars"
>>>> 
>>>> Cheers,
>>>> Ronni
>>>> 
>>>> On 30/07/2012, at 3:59 PM, Severin Crisp <sevcr...@westnet.com.au> wrote:
>>>> 
>>>>> When I start up in Mountain Lion a window opens and persists "Upgrading 
>>>>> Calendars".  The progress bar never moves and it just stays there.  My 
>>>>> iCal is fine.  I suspect this is to do with linking iCloud on which I 
>>>>> have an account but make no use of as my only other device is a Snow 
>>>>> Leopard Macbook.  
>>>>> What is the fix?  Maybe I can just cancel my iCloud account?  What to do? 
>>>>>  
>>>>> Severin Crisp
>>>>> ________________________________________________________
>>>>>              Assoc Professor R Severin Crisp, FIP, CPhys, FAIP
>>>>>  15 Thomas St, Mount Clarence, Albany, 6330, Western Australia.
>>>>>               Phone  (08) 9842 1950   (Int'l +61 8 9842 1950)
>>>>>                       email  mailto:sevcr...@westnet.com.au  
>>>>> ________________________________________________________

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