Hi, I'm glad I'm not the first one who is reporting this issue. My Joomla installation is in english. I also use the latest version of Joomulus, downloaded few days ago. I have few different modules on the right side of the site. The modules title bar which is <h3> have grey background and I noticed that the distance between the actual module and this title bar is different in case of Joomulus. This happens on all browsers I use: FF, IE and Chrome.
I have turned off SWF object in Admin panel to make troubleshooting easier but this characters are there in two scenarios - with or without flash embedded.
On attached screenshots you can see look of the website and then code in Chrome, FF and IE.