> Are you using a different mirror directory and
> deleted that cookies.txt file before capturing?
Yes, the mirror directory is different. After having catched the URL I hadn't
deleted the cookies.txt file, so I tried it just now. But the result is the
same: only the login page is captured, showing the "session expired" message.

I tried after several hours mirroring a different account by using the
configuration that I had created yesterday. As usual, it worked well. Even
without deleting the cookies.txt file.

I would like to be able to perform an immediate mirror of a different account
by catching the URL, or by copying and modifying the configuration of a
previously successfully mirrored account.