Internal Server Error using WPMU DEV Plugin

When WPMU DEV plugin is logged in, anytime I press the EDIT button in the PAGES selection window to edit a page, I get the following error:
"Internal Server Error
The server encountered an internal error or misconfiguration and as unable to complete your request. Please contact...."

When I log out of the WPMU Dashboard plugin, everything works again. For the moment, until I hear something back, I'm going to log out of the plugin to be able to edit.