we have an issue with our Alfresco Community 4.2. On one computer we are not able to add a comment to documents. The comment button is visible, but no frame for writing the text. After clicking the comment button, the button dissapears. This failure is connected with one computer only (Win 7, 32 bit, java 7.21, Flashplayer 11.7.700.224). The issue shows in all web browsers (IE, Chrome, FF). Even if I log in as another user, I´m unable to comment. I could not google anyone with same problem and any solution. Can please someone point me where the problem can be?