[@johnjamesjacoby Keymaster 6 years, 10 months ago]

Is it possible that when you updated to 2.6 you ignored the Upgrade routines?

If so, you may want to try reinstalling bbPress 2.6.3, as a last minute fix went in after it was originally packaged.

https://downloads.wordpress.org/plugin/bbpress.2.6.3.zip

If I’m correct, then you will also want to consider running the database upgrades soon. Forums with over 10k users need to do it manually, in your Admin > Tools > Forums > Upgrades