I encountered the catch 22 on using the transferred user name. When I tried to register for yuku using my old name, it told me that name was already taken. But, it wouldn't let me log in with the old name because I wasn't registered for yuku yet!
No biggie. I just reregistered with a slightly altered user name and the Freedom moderators got me cleared in no time.
One caveat. When you register at yuku, they send you a confirmation e-mail that must be clicked to confirm. That e-mail was quarantined to a junk mail folder by by e-mail program. So be sure you check your junk mail folders.