Some times my Mathematica return the result of any computation as text, I don't know why, and how to revert it. If I close and open again, it comes back to normal.
As you can see, the mouse cursor changes for this little plus circle when the mouse is over the result cell, and I can't select the text, because it's an image.
Some clue on how to come back into normal mode? I'm using Mathematica 9.