Welcome to the RH forums.
On the surface it sounds like you have done everything correctly so it should just be a case of going back and double checking that you have the correct CHM, that the mapid is exactly the same as in the app and that the app has been updated.
Thanks for the response. Looks like I am using the correct chm and that the map #s do match.
I would like to correct some misinformation:
In BugHunter, using TEXT HTML Help API, both HH_HELP_CONTEXT and HH_DISPLAY_TOPIC do work. The help appears.
Using CSH Test, the help does not display.
The developer corrected the error per email below.
An incorrect help button id, IDC_HELP1, was used in job and file comments dialogs. I changed it to ID_HELP, recompiled gui and the new help topics are popping up properly now.