I just found out that this happens only after I log out of gnome and back in again, or if I reset the X server using control+alt+backspace.
After a full restart, the system behaves normally. gnome settings still show the non-existent screen, but the mouse pointer cannot wander into its "territory", and apps behave normally.
I just found out that this happens only after I log out of gnome and back in again, or if I reset the X server using control+ alt+backspace.
After a full restart, the system behaves normally. gnome settings still show the non-existent screen, but the mouse pointer cannot wander into its "territory", and apps behave normally.