I was using adobe reader to write comments for students as I was marking (am a tutor). After marking around 50 assignments I went back to check some of the comments I had written and suddenly I couldn't open them (the comment). I can see the comment sticker/icon but am unable to click/view the comment and I'm not sure what is going on. I am using adobe reader version 11.
I can also open documents with comments from other people but the ones with my comments is there one giving problems. So I can see the comment icon is there but it's just not clickable. How can I fix this?