The webhosting company has been moving accounts to different servers, including CR - unfortunately, there was a software application - Zend - that is currently being used to help power the forums, that was absent on the new server, hence the Zend error message if you visited over the past few hours.
Zend has now been installed on the server, so hopefully everything should be running fine now.
Zend has now been installed on the server, so hopefully everything should be running fine now.