Thanks for your response!
I found out what the problem was. Somehow my topics lost all
their links to the map file. This may have occurred over six months
ago when I copied a help project from one folder to a new folder.
(Perhaps I broke the links when I did that.) Anyway, I imported the
latest HTMLDEFINES.H file and mapped my main default topic to the
HIDR_MAINFRAME map ID. This has always been the map ID for me to
assign to the default help topic whenever I want the topic to
appear from the main application window. (I compiled the help
project and tested it out with the application. The F1 link now
works!)
Another saving grace for me is that I've always created an
Excel spreadsheet of all context-sensitive help topics and list
what map ID they should be assigned to. I'm glad I've been doing
this because otherwise I'd have to re-invent the wheel and
determine which help topic I should associate with which map ID.
(Our developers always have weird map ID names that are not easily
identifiable.)
Happy Friday!
ChristyG