Hi Peter,

I hope your day is going well and thanks for asking!

If you want to add ratings to bbPress forum topics and replies, then you need to install Ratings for bbPress plugin. This is a ‘glue’ plugin to support Rating Manager and bbPress.

You can get this bridge plugin from here: https://wordpress.org/plugins/ratings-for-bbpress/

A few questions:
1) Are you using default bbPress theme?
2) Are you using any cache plugin?
3) Can you please post link to your forum?