Interface question: Layers

when i change one window panes layers…the other windows stay the same. The layer buttons seem to be independant in each window. It didn’t used to be like that. What did I do different?

I spent a long time trying to figure out why my renders were so dark. then i noticed in the camera windows the layers select were diff then the other window i was modeling in.

anyone else have this problem and know how to fix?

Well, the ~ key will show all layers. It can be a bit confusing though.