I can't imagine a dependence between the HTML5 layouts and HTML Help as you say.
What happens if you use one of the example projects? Is it broken in that case as well?
In either Rh 10 and 11, whenever I generated a project as HTML Help (even an example project) the Search functionality was broken. Finally, when I couldn't think of what else to try, I uninstalled and reinstalled Rh 10, and that solved my problem--in both Rh 10 and 11!
Apparently some file was corrupted, but I don't know what was broken or what caused the corruption. I am still trying to get some clarification from Adobe, but so far, I have only received the following comments:
- The robohelp cache folder and the preferences might have caused this.
- The problem can be either with the updates on system.
If I should receive any definitive information, I will update this post.
Odds are there was an errant DLL involved that reinstalling replaced and caused things to work again. You likely could have fixed it via the link below:
Just a note to also say that folks look at a product like RoboHelp and they see it as the "end all" solution. In reality, it does provide most of the functionality we see today. But the fact is, with CHM output, it hands the compiling process to the Microsoft HTML Help compiler. And things like Search and whatnot are then controlled by the Microsoft end for that output.
Thanks Rick for the timely reminder about Microsoft and CHM output, and for the useful link. I'll tuck that away for future reference.