".pptx couldn't be verified and wasn't uploaded to the meeting." when trying to share a PowerPoint file

Using client Lync 2013 64bit, lync 2010 server environment.  I start a meeting and can share desktop etc fine but when I try to share a pptx file I get this message:
Presentation1.pptx couldn't be verified and wasn't uploaded to the meeting. Please contact your support team.
Lync 2010 client I do not get this error.

Check permission
Attach a file in the meeting
Pause on the presentation (monitor) icon, and click the ATTACHMENTS tab.
Click Add Attachment and upload the file.
Click Manage Attachments > Permissions to choose who can download the file, or remove it.
Meeting participants can then download the file from the presentation menu on the
Attachments tab.
Also you can refer below link
http://support.microsoft.com/kb/2423938
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Mai Ali | My blog: Technical | Twitter:
Mai Ali

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