No caching plugin. And, what do you mean by “you have consistent use of www or not?” Sorry to be dense.
BTW – I’ve confirmed that most people seem to have access to all forums, unlike me. So, obviously something strange with my user account. I’ve done all the normal troubleshooting steps (clearing browser cache, restarting, trying other browsers, etc…) If I ultimately just have to somehow create a new user account, that’s fine, I guess. But, it would be nice to find an easier fix.