Hello, after updating to 1.8.20 (1.8.21 also) I have issue with DVZ Shoutbox. When users sends new message it doesn't scroll automaticly. Of course I'm using reverse order. I'm using 2.3.2 version of this plugin.
It does look like there are some issues - try the attached package (there are changes to the CSS code, jscripts/dvz_shoutbox.js, and inc/plugins/dvz_shoutbox.php).