“Cheatin’ uh?” Error

Go to your bbPress Forums settings /wp-admin/options-general.php?page=bbpress

‘Auto role – Automatically assign default role to new, registered users upon visiting the site.’

If this is already checked, uncheck it, click save, then check the box again and click save again.

See @johnjamesjacoby’s post here for more info.
https://bbpress.org/forums/topic/bbpress-2-3-now-available/page/3/#post-133250

Also bbpress.org is where you are best to ask for support issues, it was sheer luck I bumped into your post ??