Dashboard Broken!! Styles and Formatting Gone after Post Import

Whoa – I need help!

Something happened while I was importing posts through the WP Importer … after successfully completing the operation, my Dashboard and ALL admin CMS panels are now displaying in one long list, without any styles, or structure that is typically seen as the WP Dashboard. Every panel in the sidebar is now exposed as a raw bulleted list.

What happened? How can I fix this???