Hoary Upgrade - Unable to start Gnome

[steven at heimann.com.au]

I just upgraded a computer from Warty to Hoary using synaptic and trying 
to follow the upgrade notes.

Gnome will no longer start.  I get the error "There was an error loading 
the theme Human - bad size specifier scale".  If I press enter to continue 
the error pops up again.

I tried changing /etc/X11/gdm/gdm.conf to another theme but it is still 
trying to use Human.

Any suggestions.

Thank you and regards
Steven