alt-s not working

okay so i beleive this is in the right section but i have an armature and im trying to flatten it but while in edit mode with evey bone selected and i hit alt-s nothing happens some crosshairs appear but it wont let me shrink it. Please Help it should be something very simple that i cant find.

If you are using 2.54 Ctrl+Alt+S?

Alt+S scales the armature in Edit mode. Also, the bone can only be scaled depending on the position of the axis.

Thank you so much Richard Marklew