Hi !I tried using Gnome without evolution and gnome-office suite, so I removed them.
Apt removed also the "gnome" and "gnome-desktop-environment" too.Gnome works, however. But now, upgrading to 2.14 I have this bug of menu disappeared in 2 of my 3 pc.
I tried to re-install the "gnome" package and now everything seems ok. Menu remains on the desktop more than 1 nanosec as it was before. Luca