Cannot post new threads or send private messages in forum

I am getting a strange 200 parse error when I try to either post a new thread or send a private message. It then takes me to some page that say action could not be completed. Any ideas? Thank you.

This problem appears to have resolved itself, and I am no longer experiencing any issues, but it isn’t the first time I’ve encountered it. Same thing happened a few weeks ago.

Aaaaand. It’s back.

This is frustrating.

Appears to only allow me to send a private message once, then I have quit the browser and visit the forum again before I can send a private message.