Buddypress installation issues

I am having a terrible time with a new buddypress installation. The buddypress pages (Registration and Activation) are not created and link (in view mode) to sample page.
Blogs page doesn't even show as an option.

Thinking this might be a theme issue I attempted to set the theme. All themes I tried tell me I must have the default bp theme installed in order to work and that it is missing. However, I can FTP and see that it is in the buddypress plugins folder. I am completely baffled. I am not new to WPMU but it does seem to have changed a fair amount since my last install. What am I missing?

Thanks so much!
Bunni