I have this same problem, but none of the solutions proposed in this thread has worked for me. My problem is:
Comments show up on-screen and in print preview: commented text is highlighted, I can see the initials & comment number, and the comment shows up in the right-hand column.
Comments do NOT show up on any piece of paper I can create. I have tried:
1. Printing to PDF, then printing the PDF. highlights, initials, and comment #s show up. But the right-hand column is empty -- no comments.
2. Turning on the "Print Hidden Text" function in Word 2010 (FILE-->OPTIONS-->DISPLAY, then click on "Print hidden text"). This option was already enabled. I un-clicked, closed & exited, then re-opened and re-clicked. Still
3. Opening directly from Word, instead of by clicking the file. Still no luck.
Anybody have any other ideas? This has been true for over a year for me, in lots of different files.