Konsole problem

[Anne Wilson]

In theory it is possible to set up a profile for a root konsole, with the 
command either 'su - /bin/bash' or 'sudo /bin/bash'.  In practice neither 
works.  With the first example The root profile flickers up and immediately 
dies, without asking for the password.  The second case asks for password, 
but refuses both user and root passwords.  My choice is to get the first 
working, but at the moment neither are any use.

sudoers is set to allow members of the wheel group access to ALL but with 
password, and I've checked that I'm in that group.

I can't think what else could be blocking this.  Any ideas?

Anne