I have been using this plugin quite successfully on my production site for a client. I updated to your most recent version yesterday, created the new Twitter App and entered the information into the plugin settings.
Now, when viewing the site in IE9, it conflicts with the homepage (1) carousel slider, (2) Birdie's Chirps rotate/fader, and (3) the bottom bar. As soon as I deactivate the widget, everything works again. I do not have this problem in FireFox or Chrome.
Current plugin version 0.709