Just been trying some tutorials for a few days with Blender and it can be so infurating!
Select this bottom poly (which has been split from the rest of the mesh by pressing Y) then trying to do a loop cut with CTRL+R along the X axis and... you can see from the image that the area the mouse has to be in is just a few pixels!
Also tried in bottom and top (orth) views. No chance.
Why is it so hard?!
Updated link... Animated GIF