a horrible strange probleme!!

the cursor that help me precise where to add a new object in blender just disseaperd !!!
i can’t continue my project whithout that cursor!!what a strange probleme!!here is the blend
http://www.megafileupload.com/en/file/29479/project001-blend.html

Shift-c - or select an object and then Shift-s “cursor to selection”

thanks man