mu + buddyperss strange behavior

Hi !

strange sudden thing on my new network under bp 1.2.6

superadmin unable to create any new site !

The site is created, the user affected, but links in "sites" section does not redirect and the subdomain is not active

if i want to display it i have

http://passion-cheval.net/wp-admin/ms-sites.php?updated=true&action=add-blog as link

and http://passion-cheval.net/wp-admin/ms-sites.php?updated=true&action=add-blog

and http://passion-cheval.net/wp-admin/ if I click on the admin link Oo

and if i try to access directly to the new site i get an "unable to connect to database" error.

If i use the "create a blog" admin bar link, it works fine !

I have 2 blogs working fin for the moment....