Cannot logon from Thin Client

[jamesmintram at aol.com]

Hi,

I have got edubuntu running in VMWare, with the client booting from 
pxelinux and it gets as far as the login screen.
I input my login details in the screen goes blank, then drops back to 
the login screen. I have set the screen_0 to shell and tried to login 
but something very strange happens.

I input my username then press enter, then immeadiatly it comes up with 
root at ubuntu, but its as if im logged in but not - i  can type commands 
as normal but the login prompt keeps appearing.

I dont have any problem SSH'ing into my server and logging on that way.

Any help would be great.

    James Mintram