Can't access subsite after WordPress MU Domain Mapping installation

Hi there,

I tried to assign a new URL to one subsite in my WP Multisite Network based on sub-forlders (main site: http://www.320studiosnyc.com), so I redirected the DNS servers on the site where the domain is parked, and then installed WordPress MU Domain Mapping and followed all the instructions (http://ottopress.com/2010/wordpress-3-0-multisite-domain-mapping-tutorial/).
After that I can’t access the subsite neither the subsite dashboard. The DNS change has time enough to propagation, but the site still not showing up (http://www.pmpstudios.com). I’ve tried deactivating the plugin and restoring the w_2_options table, but nothing changed, if I navigate to the old location of the site (http://www.320studiosnyc.com/pmpstudios/) I’ve got a 404 error.
Finally I’ve created a new subsite within my network (http://www.320studiosnyc.com/test/), just for testing purposes. Once created I can’t access the new site, neither it dashboard (404 error). Both subsites are showing up in the network dashboard, so I’m wondering perhaps something is wrong on the database.
Any idea?

Thank you very much.