Hi petern92232561 ,
Please provide the exact dot version of the software & OS installed at your system .Also check whether is there any update available for the software after going through "help > check for updates "
Follow this thread to reset the preferences for the Acrobat software :- How to reset Preference settings in Acrobat.
Would like to know is this happening with all the documents or with certain one.
Please check with the different user account to replicate the issue , refer to this Link :- Adobe troubleshooting: Using or creating an admin account in Windows 7, 8, Vista
Let me know if it works.
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!