Just to confirm, you see this happening with Beta *1*? I was in the process of trying to work out if it was something that changed between Beta 4 and 5, but I'll abandon that quest if you're sure you're seeing it with Beta 1.utf8_general_ci
Have just tried on my local install as well on Ubuntu 13.04 and it's doing it on there also.
EDIT: Also tried on a localhost 1.2 Beta 1 running on my WAMP set up, and it's doing it on there.
$messageHtml = $bbCodeParser->render($message, array('lightBox' => false));
$messageHtml = $message;