we are using bbPress version 1 (this forum uses is too, it's still alive) with WordPress integration on.
Turning on this plugin causes a fatal error on the forums:
"PHP message: PHP Fatal error: Call to a member function get() on a non-object in /home/site/public_html/wp-includes/cache.php on line 113" while reading response header from upstream, client: 188.8.131.52, server: site.com, request: "GET /support/foliopress-wysiwyg/bug-reports/image-upload-button-missing HTTP/1.1"
We had to wrap the whole plugin main PHP file in condition and only have it executed if /support (our forum URL) is not in the request path. That works.
A real fix would be nice though!