Can't select and delete an object Okay, so this thing, is for me very strange. It still might be very obvious, but I started with blender 4 days ago.

So what is happening is that when I am rendering my animation, I have a white wall and ground where the scene grid is.

Here is a screenshot when in render mode: 

And here it is in material mode: 

I would really like to remove this, and I have tried for hours now with no success. I tried to unlink "world" from the scene but then it got all dark when rendered.

If you have any idea of what could be causing this?

(I am making an animated minecraft intro)

Edit: I was told to do alt + h and then the wall and the ground was visible in material mode as well. Here is a screenshot.



But I can't find a way to delete it...  :/
Not a bug, no black magic needed to get rid of the object.

What you have is an object that cannot be selected. The selectable switch has been disabled.



Enable that, select the object and delete it!

Those icons on the outliner are toggle switches:

Eye to make the object visible in the viewport.

Arrow for selectability

Camera to enable the object for rendering.

Make yourself a favor and read the manual page for the outliner here: https://www.blender.org/manual/editors/outliner.html