by jannesh » August 16th, 2010, 6:39 am
Hi
I assume you mean Wordpress Multi-Site. From version 3.0 onwards the MU functionality is incorporated into standard wordpress, you just have to enable it. If you upgraded from WPMU 2.9 to WPMU 3.0+ you now actually have Wordpress 3.0.1 Multi-Site.
s2Member is not yet compatible with Wordpress Multi-Site. You can use it, but there are a few things that do not work. I know Jason is working on this, but I have made a few fixes myself that I urgently needed for one of my own sites. It is in the form of a small addon plugin, dependent on s2Member. My addon is available on wordpress.org.