This problem has been corrected in 1.0v3.
Inserting a column on a worksheet that uses the Sum() function will sometimes cause the range used in the function to be incorrectly adjusted.
Example:
* Put some values into B2..B4.
* Put the formula '=Sum(B2..B4) into C5.
* Put some values into D2..D4.
* Put the formula '=Sum(D2..D4) into E5.
* Select column E and choose Insert from the Edit menu (or Command-I).
* The formula in column C now references A1..A4.