Dashboard plugin causing conflict with Upfront site

Ever since I updated the dashboard plugin it causes a conflict with my Upfront site and strips all the CSS and HTML structure from the site. It’s just a jumble of unformated text and images on a white background. As soon as I deactivate the plugin the site goes back to the way it is meant to look.

Has anyone else reported a similar issue? How do I update my other WPMU plugins if the dashboard causes my site to crash?

Hope you can help me out here!

Cheers.. brett