Only selecting what I can see

Ok, blender’s being kind of wierd. Suddenly, I can only select what is visible in the 3d view. Anything in the way, and it won’t let me. Any reason why?

Ok, problem solved by switching to wireframe, sorry for making the thread. DERP.

You’ve got to uncheck the button “Limit selection to visible”. Then you don’t have to be in wireframe…