| check if the box for "hide actionbars" is checked? if it is, free slots will not display unless you are "holding" a spell, item etc which you can drop there.
my guess is that you are slightly more experienced, and know of this, and that your real problem is that you actually sort the spells etc, but they dissapear, but you never know :P
__________________ I once had a little teaparty, this afternoon at three, twas was very small, three guests in all; I, myself, and me. myself ate up the sandwhiches, while i drank up the tea. twas also i that ate the pie,and passed the cake to me  | 
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