After 14hrs lamp use, screen showed 2 five inch green smudges in different places on screen, it was not on the lens so tried different inputs/ dvd player and leads, but smudges still there, and after a few more hours were slowly getting brighter. Unit was swopped for another brand new unit. After 20 hrs lamp usage, same fault appeared on this unit, but in different place(just the one at present).There is no dust in the room. Panasonic have said they have never had this fault before, but if watching dark films it is offputting. Has anyone ever had this fault appear? I have had to send unit back for refund as they are now obsolete. Very dissappointed as picture otherwise was supurb.