This has been fixed in ClarisWorks 2.1v2 and above.
In ClarisWorks 2.0v1, the cell references of any formula which contains BOTH a cell range AND a cell reference will NOT be updated correctly when cells, rows or columns are inserted within the specified range. An example of such a formula would be = B1+SUM(B3..B5).
This problem also occurs in ClarisImpact Tables or Data Charts.