You were right guys, compton was the problem, killing the process does help
:)
davidnotcoulthard , I didn't want to uninstall compton, I will like to leave
one Trisquel session untouched.
Sachin, editing trisquel-desktop.session line:
RequiredComponents=gnome-panel;gnome-settings-daemon;gnome-screensaver;metacity;
with
RequiredComponents=gnome-panel;gnome-settings-daemon;gnome-screensaver;compiz;
Seems not to be enough. When I tried to log using that session
"Exec=gnome-session --session=gnome-compiz" the desktop simply did not start.
What I've been doing is start compiz --replace on my start up applications.
So I guess that could work for now.
Thank you all for your help :)
