When I add objects to my scene from the add menu at the top I cant see them. They are toggled as visible in the outline and they are positioned so that I should be able to see them. However if I use ShiftA I can see them fine. This isn't a problem except that when I try to add an imported model it is also invisible.
EDIT: Here is my blend file. You can see everything except for the cube object. The cube however is set to visible in the outline and it is in the first layer. It doesnt show up in either the 3D view or the render http://www.pasteall.org/blend/33167
EDIT 2: I was just playing around with some other stuff and the cube randomly just showed up in the render, but it is still not in the viewport