Responsive HTML5 Layouts TOC Not Synching

Hello,

I hate to beat this issue further into the ground, but I have tried everything I could think of. This goes back several related issues that were discussed in other posts, but I think this one is probably unique from them. When I try to publish any project using any Responsive HTML5 output, the TOC is not synchronizing up with the displayed topic unless I navigate to the topic from the TOC itself. This is happening with IE11, the latest version of Chrome and Firefox tested on local drive and on hosting network site. I have tried the fix in Item 13 of Using RoboHelp 2017​ which does get the search to work in all the browsers, but seems to maybe have broken the synchronization. I also tried checking all the settings I could think of and the outcome is always the same. In addition, when I test any of the same projects with the WebHelp output, sych works just fine. I am using RH2017, Windows10 with the Adobe supplied patches installed.

Does anyone have thoughts on what else I can try to resolve this?

Many thanks