FE Editor and Page formatting for Wiki in Blogsmu 1.2.2 weird

Using Blogsmu 1.2.2 with WP 3.1/BP 1.2.8 Wiki appearance is 'crushed' with top tags heaping up on top of each other. Also the front end editor is just showing a white box without any kitchen sink. I assume this is a theme issue. Enclosed a capture for visualization.

Thanks for a quick hint how to "quick fix" this.