This isn't really a drastic problem, it just looks strange. I've also tried it on a different computer, and with my screen resoultion set to both 1024x768 and 800x600, but it looks the same. I'm using Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7

<URL:stuff/splitbuttons.gif>

Edit: I'm talking about the buttons at the bottom of the message box, as seen in the picture, the list Members you have recieved messages from as such boxes.

Well they are just text buttons, so they'll wrap if they don't have enough space..There's something wrong with your stylesheet, I guess, if it does it at 1024x768 too. At 800x600 there isn't enough room.

There isn't much to be done about that.

Strange, I'll go rechose the default stylesheet then.
Thanks!