Wednesday, July 23, 2014

Lync 2013 Client, Desktop Sharing shows blank screen (Windows 7, Windows 8, Windows 8.1)

I came across this problem, where a customer reported:
A user could not participate on desktop sharing session, neither in conference nor in a p2p session. Other video related submission were working, like video or white board.
First I was guessing it could have been the video driver, but if video in Lync was working it didn't sound quite logic.

After investigating this problem, I saw a ActiveX blocking Error Message in the Eventviewer:

Microsoft Lync
CLSID: {00000000-0000-0000-0000-000000000000}
CATID: {9B179D6E-9BDB-454b-BE3D-89F9A792BD39}
The ActiveX Compatibility setting disabled loading this object to help protect your security.


This let me investigate more closer into Internet Explore. Well even there is couldn't see anything directly:

Microsoft reports several TechNet article:

So you need to change the ActiveX Control Settings for Lync 2013 Client:


Go and delete both registry keys. A reboot is not necessary and it will work.

In Windows 7, Windows 8 and Windows 8.1 they are hidden here:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}


  1. Great stuff, wrote down the powershell cmdlets for last time I encountered it :)

    1. Hi Stale,
      perfect, why I didn't see your blog.

      please all, have a look into Stale's blog, very detailed and you can simply copy script from him, which you than can implement with your GPO's.


    2. Thomas Thank you very much.It work very well in windows 10 too.

  2. Replies
    1. HI Alex, always welcome. It was annoying well?! ;)

  3. Replies
    1. Hi Dailibor, tnx for your feedback. much appreciated.

  4. Thank you for this fix. This resolved my issue as well.

  5. Perfect solution ....thanks a ton !!!

  6. HI folks, I'm very glad that I could help you !

  7. Great!
    It works fine but thee string sorts of re-instates itself every now and then after logging off...annoying!!

  8. would there be more registry settings if one is using Chrome or firefox

  9. hi , will the same changes work if we are using Chrome or Firefox . the registry changes are related only to IE browser ?

  10. Thanks for this information.. its work perfectly

  11. Same here! It was happening under the 2016 32-bit and it worked like a charm.

  12. Great! Been trying to fix this freakin' problem for 2 days now by reinstalling lync. I only googled this about 30 minutes ago. Thanks!!! :)

  13. Thanks! Worked for Windows 10 and Skype for Business 2016.

  14. Hi All,

    If deleting the registry key don’t fix the issue please try this:

    Run PowerShell
    Copy and paste these lines:

    Set-ItemProperty -Path “HKLM:\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}” -Name “Compatibility Flags” -Value 8388608
    Set-ItemProperty -Path “HKLM:\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}” -Name “Compatibility Flags” -Value 8388608

    Please tell me if it works.

    1. Hi Amit,

      interesting! we would need to investigate the Value you provided. Hope I can discuss this with MSFT soon.

  15. There is no such key on both of these places, checked Win 7 and Win 10 where we have this problem. And it is occasional - sometimes works...

    1. Hi Bijo,
      could you send a contact request via the form on my blog please. I will have to exchange in your case some data, because this keys must be present. You als can try setting those keys manually for an initial test.