HTML5 published to web freezes

I'm using RH 2019 with the latest fixes. It's a merged project with Azure Blue layout. I generate once but post twice: once is via our software using CSH and once is to our client web portal (not CSH). When called via our software, everything works fine. When called from our web portal, however, and the search/side navigation is invoked, the page freezes on latest versions of Chrome, Firefox, Safari, IE. We have a coworker on an older web browser (I'm not sure what though) for whom everything works fine. I last posted to the web 5/11 and it worked for everyone. The freezing was first reported on 6/18. Anyone have any suggestions? 

Moderator: Title changed to "published" for clarity.