eNewsletter is making the dashboard go blank

After upgrading the WPMU dashboard plugin, I started getting errors in the site. I called my host for tech support and they reported a ton of errors in enewsletter. I deactivated enewsletter and all is restored to normal.

This error was repeated in my dev site as well.

Any site in the network that activates enewsletter has their back end go blank. Front end is fine, back end just a white screen.

Ideas?