Open 2 files on different layers

I open a blender file on layer 1. This works fine. I open a second file on layer 2. This works fine. However, the file on layer one gets blown away. I do things is reverse order, same story.

Earlier today, this worked fine, one file on each layer, no problem.

I figure I have switched some toggle inadvertently.

Thanks for your help in advance.

texasinmi

append your second file as a scene, then you can link them if needed.