RFD: DW inbox buttons inactive for a number of people?

[pauamma]

So there's a bunch of requests, going back to at least December 2018 and maybe at least September 2018, all reporting that some buttons on the DW inbox have no effect when clicked. The buttons concerned are "Delete Selected", "Mark Read", "Mark Unread", and perhaps "Delete All". The requests themselves are:

https://www.dreamwidth.org/support/see_request?id=40012
https://www.dreamwidth.org/support/see_request?id=39872
https://www.dreamwidth.org/support/see_request?id=39869
https://www.dreamwidth.org/support/see_request?id=39827
https://www.dreamwidth.org/support/see_request?id=39796
https://www.dreamwidth.org/support/see_request?id=39626 (which has a copypasta of the Chrome console error log that may be a clue)
https://www.dreamwidth.org/support/see_request?id=39566
https://www.dreamwidth.org/support/see_request?id=39201
https://www.dreamwidth.org/support/see_request?id=38992 (but it is unclear to me whether this is the same problem)

However, the "Delete Selected" button works for me. Any opinion? Could it be add-ons interfering with Javascript? (The copypasta seems to me to be hinting at a code error in some Javascript library inherited from 6Apart instead, but I'm not a Javascript kinda crab.)