I've been having this problem as well recently - is it something to do with the software update? I've been trying to figure out what the problem is for ages and your post and resolve seems to have worked for me. I had got as far as removing the .nomedia file but on the sd card rather than back...
No, that's just the actual lighting colour. It seems that when the spotlight is pointed on a specific person/area, that area soaks up all the light. I'm not sure, but that's what it looks like.