Hi, @Eugene Manuilov,
I installed the beta of the Membership plugin that you linked to for me in this thread:
That was great and it took care of the issue from that thread.
However, I have discovered that upon registration, new members are no longer being forwarded to the Welcome page that I defined in Membership->Options->Membership Pages.
Instead, they were being shown the blank "Registration completed message."
So I tried inserting the following into the "Registration completed message" text box:
Please click <a href="http://thememoirnetwork.com/?p=6217/">here</a>.
That should take the user to the Welcome page.
However, it returns this link: