Hi,
I will help you upgrade your S2 resources, I am membership expert developer, you can find my buddypress membership plugin at [login to view URL] and you can find my bbpress membership plugin at [login to view URL]
I am WordPress expert, my plugin/themes listed on wordpress official site [login to view URL] since 2008:
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Some of my site is based on s2member too, I believe my quality will be the best one!
Would you please tell me more details about your S2 problems?
I am sincerely hope work for you soon
Best Regards,
Tomas