You have something wrong happening on your system.
Are you sure you had turned Notifications back on after you had disabled it 
prior to carrying out my suggestion?

I haven't seen your reply to Peter's help.
What was your result when you carried out Peter H suggestion? 

/Begin Quote from Peter's reply message:
"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"
/ End Quote from Peter's reply message

Cheers,
Ronni
Sent from Ronni's iPad4


> On 5 Nov. 2016, at 2:11 pm, Marcus F Harris <[email protected]> wrote:
> 
> Thanks Ronni,
> I don’t wish to take up your time on this problem.
> I used Activity Monitor and when I went back NC it faied again with “not 
> responding” I repeated that so I can say it didn’t work
> Then I went to Terminal and entered killall NotificationCenter as you 
> suggested.
> Nothing happened after I pressed “return” Or if it did there wasn’t a 
> response from NC.
> Maybe I have some Malware, but Sierra is working fine other than this NC 
> problem.
> Disk Doctor says AOK.
> Should I try some other startup command?
> Cheers and thanks
> 
> 
> Marcus
> Marcus Harris
> P.O. Box 7135
> Marcus Harris
> Shenton Park
> Western Australia 6008
> Australia
> Cryptodome Pty Ltd
> [email protected]
> Mob: +61 (0) 417965618
> 
> 
> 
>> On 3 Nov. 2016, at 10:14 pm, Ronni Brown <[email protected]> wrote:
>> 
>> Hi Marcus,
>> 
>> You DON’T delete anything that in Terminal!
>> 
>> You add the command prompt killall NotificationCenter after :~ cryptodomus$ 
>> killall NotificationCenter
>> Then hit Return key on your keyboard.
>> But - If you are not familiar with Terminal I would prefer you use Activity 
>> Monitor.app.
>> If you make a mistake in Terminal you can do a lot of damage.
>> 
>> 1. Open Activity Monitor.app
>> 2. Use the Search bar in the upper right corner Activity Monitor and type 
>> “Notif”, then click on “Notification Center”
>> 3. Now click the (X) “Quit Process” button, and choose “Quit” to relaunch 
>> Notification Center
>> 
>> Notice the Notification Center menu bar icon disappears and reappears when 
>> you kill it from Activity Monitor, this indicates it has been restarted.
>> 
>> Cheers,
>> Ronni
>> 
>> 13-inch MacBook Air (April 2014)
>> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
>> 8GB 1600MHz LPDDR3 SDRAM
>> 512GB PCIe-based Flash Storage
>> 
>> macOS Sierra 10.12.1
>>  
>>> On 3 Nov. 2016, at 9:08 pm, Marcus F Harris <[email protected]> wrote:
>>> 
>>> 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]> 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]
>>>>> Marcus F Harris
>>>>> [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]> 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
>>>>>> 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]> 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]
>>>>>>> Marcus F Harris
>>>>>>> [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]> 
>>>>>>>> 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]> wrote:
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> On 27 Oct. 2016, at 10:56 pm, Marcus F Harris <[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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