The PM system has now been replaced with a "chat" style message system. If your chat layout looks screwy, make sure you clear your local cache in your browser, or Shift F5 on a Windows PC to force the browser to reload the new style sheets for the chat page.
Are the messages still Private - ie between myself & who I've messaged as at the bottom of most of the messages you can see a small icon for the person I've messaged, plus other people I've sent messages to as well - all saying that they've read it (Some have 3 people, some have 4 people) so want to make sure that only the intended person has read the message as at the mo it looks like everyone I've sent PMs to has seen everyone elses message as well...
Also some people (inc myself) are not being notified of pms - only finding out when logging in & going to messages.
Sometimes I get an email - but most of the time I only find them by logging in and looking.
So not sure what's happening with it.