[Andi North]

When I upgraded a WordPress installation to use 4.0 from 3.9 the topics would not show on the loop-topic template neither would the topic content show when on single-topic.

I deactivated all plugins (bar ACF and bbPress) and used the default WP theme but the issue still prevailed.

I then reactivated all themes and plugins, bbPress was still broken.

I then overwrote the /wp-admin/ and /wp-includes/ folders of the installation with the WordPress 3.9 version(s) of the files and bam! bbPress was back to life.

There were no error logs on the website either.

Any ideas?

WordPress 4.0 isn’t critical to the site but it’s always important to keep on top of updates.