Hi Ronni,
Great but I’ve not attempted to work in terminal before.
I found the app and opened it.
the text “Marcus-F-Harris-iMac27:~ cryptodomus$ “.appears.
Do I then delete this and enter the instructions you sent “killall 
NotificationCenter” ?
Or do I open a new window?
Then what?
Hate to stuff up in terminal.
Cheers
Marcus

> On 2 Nov. 2016, at 9:31 pm, Ronda Brown <[email protected]> wrote:
> 
> Hi Marcus,
> 
>> Is it possible to reset NC somehow?
> 
> Reset/Restart Notification Center:
> You can forcibly restart the Notification Center in Terminal.app by issuing 
> the following command string:
> 
> killall NotificationCenter
> 
> Note there is no space between the names 
> 
> Cheers,
> 
> Ronni
> 
> Sent from Ronni's iPad4
> 
> On 2 Nov. 2016, at 4:41 pm, Marcus F Harris <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>> Hi Ronni,
>> Thanks for your advice. Yes, Sierra otherwise operates just fine.
>> I pretty much know how NC works as I had no issues before with El Capitan.
>> 
>> I wouldn’t be concerned except when NC is functioning it reveals Mail alerts 
>> which cover the RHS of the screen and cannot be deleted. In fact if I point 
>> the mouse any where near the alerts, the system will freeze with the 
>> spinning wheel turning for up to 20 seconds.
>> 
>> I have turned all the NC alerts off  and that clears that up. As soon as I 
>> turn Mail back on the alerts reappear and block the screen.
>> Then I have to restart.
>> 
>> I have a lot of emails in iCloud as I’m uncertain how to delete them en 
>> masse so maybe that’s an issue
>> 
>> Is it possible to reset NC somehow?
>> Cheers
>> 
>> Marcus
>> Marcus F Harris
>> [email protected] <mailto:[email protected]>
>> Marcus F Harris
>> [email protected] <mailto:[email protected]>
>> iMac 27D Late 2009
>> OS10.12.1
>> 3 GHz Intel Duo Core
>> 8Gb Ram
>> 
>> 
>> 
>>> On 1 Nov. 2016, at 9:36 pm, Ronda Brown <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> Hi Marcus,
>>> 
>>> I have not experienced any problems with Notification Center in Sierra or 
>>> iOS 10 on my Macs and iDevices. So I don't think your issue is caused by 
>>> Sierra.
>>> 
>>> Have you had a good read on how to use Notification centre in Sierra?
>>> https://support.apple.com/kb/PH25142?viewlocale=en_US&locale=en_US 
>>> <https://support.apple.com/kb/PH25142?viewlocale=en_US&locale=en_US>
>>> macOS Sierra: Use Notification Center.                                      
>>>             
>>> Alerts, alarms, reminders, email-chances are you see a steady stream every 
>>> day. Notification Center is Sierra's Grand Central Station for the 
>>> information competing for your attention. It's settings control which apps 
>>> can post messages to the upper-right corner of your display, as well as how 
>>> those messages look.
>>> The Notification Center sidebar, which slides in from the right of your 
>>> screen, gives you an overview of it all.
>>> 
>>> Have you set control Notifications' look? Individual notifications appear 
>>> at the top-right of the screen. You can tweak how they appear, or whether 
>>> they appear at all, on an app-by-app basis.
>>> Go to System Preferences > Notifications and select an app from the list at 
>>> the left. Now set up the way that app will notify you at the right. You can 
>>> pick from three Notification styles.
>>> 
>>> Cheers,
>>> Ronni
>>> Sent from Ronni's iPad4
>>> 
>>> 
>>> On 1 Nov. 2016, at 7:29 pm, Marcus F Harris <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>>> Hi,
>>>> I’m still trying to resolve this corruption of (NC) Notification Centre.
>>>> NC operated well with El Capitan but is problematic with Sierra.
>>>> 
>>>> I think it is due to interference between Google and Apple mail accounts. 
>>>> I have tried turning them on and off alternately and the freezing of NC 
>>>> arises when email notices present to be either closed or replied to.
>>>> If I try either of those options, nothing happens and the NC freezes for 
>>>> up to 20 seconds. 
>>>> As long as these email notices don’t appear I can switch on NC.
>>>> 
>>>> BY THE WAY the email notices that appear are all from my gmail account.
>>>> 
>>>> I’m going to turn off gmail completely and access them from the website 
>>>> and see if that makes a difference.
>>>> If you have any other ideas, please feel free to let me know.
>>>> 
>>>> 
>>>> Cheers
>>>> 
>>>> Marcus
>>>> Marcus F Harris
>>>> [email protected] <mailto:[email protected]>
>>>> Marcus F Harris
>>>> [email protected] <mailto:[email protected]>
>>>> iMac 27D Late 2009
>>>> OS10.12.1
>>>> 3 GHz Intel Duo Core
>>>> 8Gb Ram
>>>> 
>>>> 
>>>> 
>>>>> On 28 Oct. 2016, at 2:04 pm, Marcus F Harris <[email protected] 
>>>>> <mailto:[email protected]>> wrote:
>>>>> 
>>>>> Thanks Peter and Ronni,
>>>>> I have an apple Bluetooth mouse only.
>>>>> I have two gmail accounts and one iCloud account.
>>>>> I will try turning off the gmail accounts and see if that helps.
>>>>> Let you know ASAP.
>>>>> Cheers
>>>>> Marcus 
>>>>> 
>>>>> Sent from Marcus iPhone 5
>>>>> 
>>>>>> On 28 Oct. 2016, at 7:58 am, Peter Hinchliffe <[email protected] 
>>>>>> <mailto:[email protected]>> wrote:
>>>>>> 
>>>>>> 
>>>>>>> On 27 Oct. 2016, at 10:56 pm, Marcus F Harris <[email protected] 
>>>>>>> <mailto:[email protected]>> wrote:
>>>>>>> 
>>>>>>> Someone else may have problems with the Notification Centre since 
>>>>>>> installing Sierra and had feedback that I missed.
>>>>>>> 
>>>>>>> Notifications appear as before on the RHS of the screen. These are 
>>>>>>> mostly MAIL notifications.
>>>>>>> 
>>>>>>> Before installing Sierra with El Capitan all my apps worked well.
>>>>>>> 
>>>>>>> Now Notifications will not respond to mouse clicks and the system 
>>>>>>> freezes for up to 15 seconds before responding.
>>>>>>> 
>>>>>>> I have tried disk doctor and looking for a solution in System prefs, 
>>>>>>> but I’m stumped.
>>>>>>> 
>>>>>>> Any advice gratefully received
>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> Everything is working fine on my system Marcus. Whatever else is going 
>>>>>> it’s unlikely to be a Sierra issue per se; more likely something else 
>>>>>> you have running that needs an update.The tried and true simple trouble 
>>>>>> shooting  resource is to log into another account on your computer 
>>>>>> (create a new one if necessary) and see if the problem persists, just to 
>>>>>> rule out the possibility of something specific to your account.
>>>>>> 
>>>>>> Peter Hinchliffe        Apwin Computer Services
>>>>>> FileMaker Pro Solutions Developer
>>>>>> Perth, Western Australia
>>>>>> Phone (618) 9332 6482    Mob 0403 046 948
>>>>>> --------------------------------------------------------------------
>>>>>> Mac because I prefer it -- Windows because I have to.
>>> 
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