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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