Added New User Account but can't access

am trying to play LOTRO but have yet to get passed the "cannot save data
files" error. Their Support is trying to help me and for the third pass, has
suggested I set up a new user account as a standard user. (I previously had
only Admin and Guest). I set up the new account just fine, but it will not
appear when I try to change log ons. I have restarted, logged off, and shut
down and STILL have not seen my new user account. I've set a password, then
deleted it in the hopes that would make it appear but no go. Please help!!