GDM Problem

[Piers Kittel <edinfo-list@biased.org>]

Hello all

Changed my apt sources to get the testing packages, did an apt-get 
update then apt-get upgrade, and now GDM won't work properly - when the 
PC boots up and loads GDM, I just see the default grey/white screens on 
both of my monitors and the pointer is the black cross.

Exiting GDM and disabling it, then typing "startx" works just fine though.

Any ideas on how to fix GDM?

Thanks very much for your help in advance

Cheers - Piers