Originally Posted by jschiwal
Change the XGL settings with /opt/gnome/bin/gnome-xgl-settings. It is supplied in the compiz-gnome package.
Thank you, I realised what was going on, something to do with the fact that my graphics card doesn't support the XGL desktop effects even though they do work, I remember when I enabled it before it said that the card I'm using wasn't in the list, I disabled it and now my NVIDIA X Server settings are working again. Yippee! Thanks a bunch to the both of you, I should be ok now, hope that this problem I've had might help somebody else in the future like it did for me!
Take care, once again many many thanks for the help! :-)