We installed Update 2 for RoboHelp 2017 this week and found that searching from projects that use the Indigo HTML5 layout no longer works from Internet Explorer 11 but it continues to work in Chrome. We had no problem with IE11 prior to applying Update 2. Could this be a bug in Update 2? Is there a workaround? How can I remove Update 2?
See if this thread helps. There's a bug report with some files that have fixed a search issue for some people.
If it doesn't help, add your voice to the bug report listed in the thread.
To uninstall Update 2 you need to uninstall robohelp and then install the the previous update. If you don't have the previous update, you should be able to download it here:
(sometimes the links break, in which case you'll need to contact Adobe).
I found this page Tracker and tried replacing the two JS files loadparentdata.js and loadprojdata.js that you can download from there and it appeared to have fix the problem on all but one test PC - I'm just working on that now as I suspect the cache isn't clearing properly there and it's still using the old JS files.
This sort of problem puts you off applying the latest updates so soon after they are released!