When I generate webhelp using RoboHelp HTML 10 the TOC initially appears. At the bottom of the Internet Explorer screen id the dialog to allow blocked content. When I click Allow the TOC disappears and the Search pane fills with nonsense text.
Are you completely patched up? RH10 is quite old now & needs patches to be able to display properly with browsers these days.
I ran updates and it says it is up-to-date?
What point version are you on? Was this working before for you & now doesn't?
This is my first build of this project.
I suspect that in the Navigation settings in your output layout you have selected Pure HTML instead of DHTML.
See www.grainge.org for free RoboHelp and Authoring information.