Windows 10 taskbar has strange behaviour

On a windows 10 machine (upgraded from Win 7) some strange behaviour of the taskbar is manifesting itself.  The leftmost three icons (Windows, search and task view) do not respond to a left button mouse click.  All other quick links on the taskbar work.  When the mouse is over on sees tooltips for the search and task view buttons (same as my work PC) and a right mouse button click will bring up a context menu.  The mouse left button seems to work normally everywhere else so I don't think it is a hardware problem with the mouse.
Some weeks ago everything behaved normally.  I don't know when this behaviour appeared and the PC is only used occasionally.

Any ideas on what is going on and how to bring the normal behaviour back.
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AndyAinscowFreelance programmer / ConsultantAsked:
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AndyAinscowConnect With a Mentor Freelance programmer / ConsultantAuthor Commented:
Sorry for the delay.  This problem didn't seem to return but the PC in question has since died with other problems.
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JohnBusiness Consultant (Owner)Commented:
Some weeks ago everything behaved normally.

1. Look for viruses and malware.
2. Run Windows 10 updates. New rollup during this past week.
3. If no joy, run DISM

Open cmd.exe with Run as Administrator.
DISM.exe /Online /Cleanup-Image /Scanhealth (takes 15 - 20 minutes).
DISM.exe /Online /Cleanup-Image /Restorehealth (takes 15 - 20 minutes).
Restart the computer and test.
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McKnifeCommented:
Often, this is due to user profile specific problems. That behavior is seen for one user and not for another. So a test you should run is to log on as another user that you have to create for this test and see if it works there.
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Ganesamoorthy STech LeadCommented:
might be issue with the user account, check with new account

http://www.windowstricks.in/2015/11/start-menu-windows-10-not-working.html
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
Thanks for the responses.
No viruses - anti virus programs are installed and running.
Updates - should be up to date, installed automatically.
DISM - ?  Is this the same as the following?  The hard disk is OK, I have run an error check from disk properties and the fragmentation is at 1%

User profiles - One one user.

ps.  I was told the problem happens continuously.  After a reboot yesterday it worked normally, I found that out after writing the question.  Looks like it might be an intermittent problem.
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McKnifeCommented:
"One one user"?
=happens for one user only
or
=you only have one user and did not create a test user?
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
Ahh - Only one user configured for this PC.
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McKnifeCommented:
Please do as advised and create a test user and retry with that one.
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
I'll give it a try but as I said it seems to be an intermittent problem after all - or it has just gone away coincidentally.  

The worst sort to track down and test possible solutions against.   :-(
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nobusCommented:
i have seen it disappear after a reboot; sometimes 2
i think it is caused by an update, that is not fully installed
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
>>i have seen it disappear after a reboot; sometimes 2

The PC has had this behaviour for a few weeks -  or at least I have been told that - so it has been rebooted a number of times.
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JohnBusiness Consultant (Owner)Commented:
Given what you have done, I agree with the others here: Make a new, test Windows User Profile (Account). Log into the new Windows Account and test.
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
I've not yet got around to creating another user, partly because this behaviour hasn't appeared since I asked the question.  The PC is behaving normally.
I'm going to wait a while.  It may well be that an update hadn't installed properly (or was buggy  8-\ ) and has since got sorted out.
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McKnifeCommented:
Then close this question by selecting your own comment as an answer since no possibly helpful comments could be applied.
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
No solution found but useful advice should anyone encounter a similar problem
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