Hard to tell, especially if Apple engineers were not able to tell you. 
Probably, you did not let the entire 10.12.to update Ron which also installs a 
couple of Firmware  updates that make the computer more secure. I would let 
this run for 20 to 30 minutes and see if it still occurs

Best wishes,

Jonathan Cohn 

> On Jan 3, 2017, at 9:07 PM, Helga Schreiber <helga.schreibe...@gmail.com> 
> wrote:
> 
> Hi all! How are  you all? This is an urgent thing that I will  like you guys 
> to help me figur out why it occurs or if you guys are having it as well on 
> your Mac computers. So after I updated my MacBook Air 11 inches to IOS 
> 10.12.2, when I turn on my computer this apple logo  appears  with a message 
> saying Installing Progress has no windows, and  I can't go anywhere. When i 
> ask my brother h who  is sighted, he says that I have  my user  name and  
> password field,an I call  apple accessibility more than four times and they 
> fix it by doing recovery, a force shut down after four tries, and today I 
> perform  VO Shift Space bar, and it brought me to my username field and 
> password field. Are you   guys experiencing this issue? Just wondering. This 
> began for me on Sunday, December 25. I install IOS 10.12.2 on Wednesday, 
> Decmember 21, then four days later this apple logo appears with this  message 
> when I turn  my Mac   on my Mac, adn it appears again after four days on 
> December 29 again,and finallay today. And also,  as some  of you know the use 
> authentication window stil is announce by Voiceover and there  is not window 
> about that. So Do yu guys have nay idea why is this  issue occurring after I 
> instal IOS 10.12.2? Voiceover says wen I move vO right, Installer Progress 
> ahs no windows,and nothing else. I wil really appreciate any help you guys 
> can provide me regading this matter. I look forward in hearing form you soon. 
> Thanks and God bless!
>   Helga Schreiber 
> Group Moderator  
>  
>   for the IPad help for the blind 
>  
> ipadhelpfortheblind+subscr...@groups.io  
> 
> Member of National Federation of the Blind and Florida Association of Blind 
> Students.
> Member of the International Networkers Team (INT).
> Independent Entrepreneur of the Company 4Life Research.
> Phone:  (561) 706-5950 
> Email: helga.schreibe...@gmail.com 
> Skype: helga.schreiber26 
> 4Life Website: http://helgaschreiber.my4life.com/1/default.aspx 
> INT Website: http://int4life.com/ 
> 
> "For God so loved the world that he gave his one and only Son, that whoever 
> believes in him shall not perish but have eternal life." John 3:16 
> Sent from my iPhone 7 running IOS 10.1.1    
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