[Clicknathan]

The error was from a Private Messaging plugin (note: not a private forums plugin).

I have the default Akismet & Bozo plugins installed, and also the “Use Display Name” (which just changes your username to your nicename) and BBPrivate Messaging Plugin (as mentioned above) plugins installed. Removing them does not allow me to see the forums content either.

I just noticed that actually only admins can see the forum content.

You asked:

You didn’t make all your forums categories in the admin, did you?

I’m not sure what you mean, I’m new to BBPress. I converted an old WordPress XDForum plugin to BBPress, so perhaps something happened with permissions there, but even so, any direction as to how to open these up to everyone would be great!