I have an old Exhibit application that uses version 2.2.0 and it stopped working in Chrome. Viewing the console in "inspect" view showed that the call to the exhibit-api had a http URL and it required https. I fixed that, but it still doesn't work because apparently the Exhibit code calls an Ajax URL with http. I cannot change that to https because it is not in my code. This only happens in Chrome -- the app works OK in Edge. This is a pretty complex app and upgrading to version 3 would be a LOT of work -- and frankly I don't really remember how the app works now anyway. I did this a LONG time ago.
Incidentally, I had the same problem with another Exhibit app which I coded using version 3, and changing my call to https did solve the problem there.