Can't say exactly what might have done this, (I was trying Xephyr and removed some old kernels in my last good session..) but now I can see that some mess has been made.
The themes don't apply properly, here's a snapshot. The dark colours of the panel and the menu bar are not meant to be for my Radiance theme. The Icon themes too resist to change;

I tried to login with gnome2 environment and all I get is a super zoomed window, the mouse cursor almost than the size of my palm! (but gnome2 is working fine for another user in the system);
How can I fix these?
Update 01:
Here's a snap showing gnome-tweak-tool and dconf-editor window theme is already set to Radiance but still...
Something seems to be wrong with Shell Theme.. Is it?

(..also I noted Adwaita being default, shouldn't that be Ambiance? Isn't Ambience the default for Ubuntu 12.04?)
Update 02:
Despite changing Icon theme to Moka and Window theme to Radiance the changes don't apply.

Firefox shouldn't appear the way it is now with Radiance..

