Acrobat 11 Pro: sticky note or typing inserts appear, but I can't type into them.

YatharthS:  A user at my office has experienced the same issue as Petern. He has initiated a Shared Review and cannot add comments to the review himself.  If he attempts to add a Sticky Note, the icon is placed and text box seems ready for typing entry, but no typing input is allowed and the Sticky Note symbol remains with no accompanying text.  Same for replying to Reviewers' comments.  He can choose Reply, but cannot type in the text white space.  He was able to add a Stamp to the document and publish that comment to the Shared Review.  We have over 30 other users successfully utilizing Shared Review feature for approximately 3 months and this is the first we've seen of this issue  (using Windows 7, Microsoft Office 2013 Outlook client, Acrobat XI Pro, Shared Review comments housed on Network server folder).  Thank you for your help!