bbPress.org

Ok, it looks like the problem is partly in our theme, but there is a change in 2.5.5 not mentioned in the changelog that is triggering the issue. It seems to be related to this:

https://bbpress.trac.wordpress.org/ticket/2607

We have a check on WP_Query->is_search that is returning true in the topic and reply loops when I believe it should be returning false. The resolution of the above ticket was supposed to fix this same issue…