Thanks Robin. Not sure what that means but Thank You.
The only thing I have in addition to bbpress is LearnPress Plugin that integrates with bbpress.
I resolved mine by rolling back to a previous edition of bbpress. Clearly the bbpress update has issues and indeed caused 404 havoc on my website as well.
I had the same issue….I freaking panicked. I had my host restore to yesterday’s backup. The bbpress update did the exact thing to my site…404 on Everything.