And I answered a few seconds after receiving the file.
To every users attention :
When fill down behaves wrongly, check if the column is a coherent one.
If the group of cells is not a true column but the result of a merge process applied upon the rows which you try to fill down, don't search more. The culprit is the fact that you merged.
Look at this first screenshot.
I started from a two rows table.
I merged D2 and E2
Then I dragged the bottom left handle to the bottom to create new rows.
I inserted a simple formula in the cell resulting of the merge process upon D2 and E2
Fill down doesn't apply.
Numbers is fair with us.
Look at this second screenshot.
I started from a two rows table.
I inserted a formula in D2
I merged D2 and E2
Then I dragged the bottom left handle to the bottom to create new rows.
The AutoFill feature applied but Numbers took care to un-merge the newly created cells.
Yvan KOENIG (VALLAURIS, France) lundi 31 janvier 2011 19:03:07