I have a problem with the lamps. When I first create them, it all goes fine. But at some point of making them, or when I deselect them and work in other stuff, they get lost in the viewport. Only their light is visible in the material mode, and they still appear listed in the outliner, but I can't select them.
If I try to create new ones, they don't cast any light.
What can I do? Is there any way to reset the lights or something?
Thank you so much!
P.S. I'm using the Blender Render engine.
EDIT: I was asked to post some screenshots, so I tried to put lamps on my project again.
This time, the lights didn't work from the very beginning. I haven't changed anything in the project since the last time I tried, so this behavior in Blender seems completely senseless to me, like a bug.
Here, I turned off Environment Lighting.
These are the material settings for the mesh I'm trying to put the lights in.