Drupal Commons - post-install: wrong layout

I have successfully installed DC, but as soon as I tried to use it (www.namasen.net/drupal) I realize something must have gone wrong with the actual theme... It appears as if there is no layout at all.

The situation does not improve when I select any alternative theme (with some difficulty though, to locate the right menu).

I would appreciate greatly your feedback. Thanks immensely.

Yours

M

UPDATE: I had to disable the "Optimize JavaScript files" & "Optimize CSS files" options and this apparently solved the problem.