Re: Can’t add additional tags to post
I experienced the same problem, and deactivating the “Use Display Name” plugin fixes it for me too. Something in the “Use Display Name” plugin may be broken. (But with previous version of bbPress, it works fine.)
There is another strange thing. The “display names” from WP are still displayed after deactivating the plugin, but only in the topic listings, not in the threads. This isn’t exactly what I’d expected…