[@jaredatch Member 13 years, 1 month ago]

There is a thread on this on WordPress.org – https://wordpress.org/support/topic/error-on-forum-pages?replies=7#post-4519232

Genesis 2 does not fully support bbPress. A fix is needed either in Genesis core itself or the compat plugin, but is not yet in place.

If you run bbPress do not upgrade to Genesis 2.0. Keep an eye out on that plugin for a future update to hopefully address the issue.