Login problem

[john]

Howdy!

Yesterday I installed Ubuntu on my desktop (good stuff).  Everything
works for the user I created during installation.  I added another user
("adduser amanda"), and she can't login: the X screen blanks to the
background color and nothing happens.  The mouse cursor is still there,
and I can kill X and get back to the GDM login screen. At first,
the .xsession-errors was filled with permission denied on
reading /dev/dsp.  Then I added amanda to all the groups that the
default user was in ("amanda adm dialout cdrom floppy audio video
plugdev lpadmin") and the same thing happens, but at least
the .xsession-errors looks normal.

Any ideas?  Thanks!

-- John