Sidebar Formatting Problems with Mandigo

I recently updated my theme from Mandigo 1.13.1 to Mandigo 1.24. Now I’m having a hard time with my Sidebar 2. I am using WP ver. 2.2.1. The problem is, it seems, that the sidebar no longer expands to include my Shoutbox or anything else that I try to put into it. When I try to add a 2nd widget to the sidebar, it is pushed off the edge of the screen to the right of where it should be, off the sidebar. I’m sorry I can’t describe the problem better, but here is the site:

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You can see that the background of Sidebar 2 is far smaller than the Shoutbox, which is inserted via HTML located in a text widget.

I know very little about code, so any help would be appreciated.