This is a bug that was reported in RoboHelp 8 but has not yet been fixed. The more people who report a bug or request a feature, the more likely it is to be actioned. Please follow this link.
Meantime you need some sort of solution. The information is held in each topic in the format
<meta name="topic-check-list" content="YourToDoName" />
You can confirm that by using the built in Find and Replace in Files (Edit menu) but you will be no further forward as you cannot print anything from there. I used FAR from www.helpware.net/FAR and using that you can create a text file report.
See www.grainge.org for RoboHelp and Authoring tips
Thank you Peter. I suspected it was a bug but didn't know what to do about it or how to solve my immediate problem. I'll give that a try. Once again, thanks for your help. You rock!
Forgot to mention. I did enter it as a bug report - trying to help to make the wheel squeak!