I confirm too that the issue is gone after turning off auto login (at System->Administration->Login Window->Security).
This might be also important: each time I after install (not start, but install) Ubuntu 8.04, when the first time I access this option it takes like forever to display this window (sometimes I have to restart the computer, regardless of AMD or Intel chip). So perhaps this bug gets "auto-created" at this point?
I confirm too that the issue is gone after turning off auto login (at System- >Administration ->Login Window->Security).
This might be also important: each time I after install (not start, but install) Ubuntu 8.04, when the first time I access this option it takes like forever to display this window (sometimes I have to restart the computer, regardless of AMD or Intel chip). So perhaps this bug gets "auto-created" at this point?