BP Social Theme 1.2.3 upgrade

I wanted to upgrade the BP Social Theme from 1.2.2 to 1.2.3. When I try to update through Dashboard, I get the message:
An error occurred while updating BuddyPress Social: Update package not available..
After I tried to update manually (by removing the old directory themes/bp-social and installing the new bp-social directory), the webpage did not look the same anymore:
1) None of the widgets contained anything that was previously there
2) When I clicked on the activity menu in the header it took me to http://mydomain.comactivity instead of to http://mydomain.com/activity (similar for members, groups, forums...)
I'm using WP 3.1.3 and did not make any changes in the old parent theme.