The rendering of page content has slowed down slightly following our move to a different way of displaying the ad on the right hand side.
We're working on speeding it back up but generally what is happening is that the page displays and then the ad takes a while to 'catch up'. This is not a problem on most pages and for anyone with a fast internet connection (probably don't even notice) but in the instance of the 'My Messages' page the message content is being displayed AFTER the ad.
For you not to see your messages I'm guessing that you have a slow internet connection and are not waiting for the page to complete the whole display. What is the speed of your internet connection?