As mentioned, I've tested extensively, and the only way to get the quote feature in topics working again is to disable both NB40 plug ins, not one, but both. Disabling the other plug ins doesn't affect this issue.
Also, it is strange that you cannot see the Quote buttons in topics, as that is not a reported issue on our forums...only its functionality is the issue:
https://www.celiac.com/gluten-free/topic/118507-quote-feature-not-working/
Of course, to see that button you would need to create an account and be logged in...