clear your cookies, the ones datatables saved when you were using bStateSave and you had 10,25,50,100
then refresh and it should now save 1 or 2 or 3
do you mean
"aLengthMenu": [[5, 10, 15, 25, 50, 100 , -1], [5, 10, 15, 25, 50, 100, "All"]],
"iDisplayLength" : 10,