Problems with a subsite installation.

Hi,

We are trying to set up development environment for our wordpress/marketpress/multisite installation under dev.domain.com - The main website works fine - domain.com. But the dev website which is located uder public_html/dev is not working properly. The homepage doesn't reflect the theme, and all the links are broken.
I'm confident in that the website files were copied properly as we use git. The database is properly configured as well. Plus the local install on my laptop is working fine. Do you know of any isssue that could be causing it?
Thanks.