Well thankgod! I have been internally stressing as I have noticed when I vacuum I can't see where I've been (on hard wood floors and tiles with lots of dog hair) I never had this problem before. I normally wear glasses everyday anyhow but have been not wearing them while I read my uni texts as it gives me double vision after awhile (cos my glasses are for driving and watching tellie not reading) so thats why i can't see the floors! Interesting..I'll stay away from the dreaded google monster for now