Without seeing the formula I would say you should make the Table references
Absolute.
=VLOOKUP(D2,$A$1:$C$25,2,FALSE)
D2 will change as you autofill but the Table will stay the same.
OR give your Table an defined name.
=VLOOKUP(D2,myTable,2,FALSE)
Gord Dibben MS Excel MVP
>It's driving me crazy! It seems like I could use the auto fill
>function and it would keep the correct cell references for the
>lookup. What am I doing wrong?