Just to let you know I am having this issue (tweets are wider than sidebar)with plugin v1.42 and WP v3.71 using a Genesis 2.01 based theme.
Adding the code from post http://wordpress.org/support/topic/widget-out-of-line-with-sidebar?replies=9 to the CSS file DOES resolve the issue. So my site’s working now, but it doesn’t seem that the coded process for resolving it is working in this example.
If you would like to review you can see it at http://www.FreddieBell.com/radio.
Gregg
