[@sdp Member 15 years, 3 months ago]

Correction. It doesn’t appear to be using the page.php template file however it is definitely piggybacking off the current wordpress theme somehow, because specific dynamic sidebars appear which are only called within my theme. It’s very confusing.

Although this question is highly related to the issue you’re having, I started a specific thread here:

https://bbpress.org/forums/topic/which-wordpress-template-file-gets-used-by-bbpress-plugin