I figured out what Nick was suggesting, and the following is the error number & description that I\'m getting:
\'-2147417848 (80010108)\' Automation
This solution works for me:
Before adding rows with Shift:=xlDown delete bottom rows on the worksheet
'ADD THE ROWS YOU WANT Sheets("XXXXXX").Range("A100000:A100100").EntireRow.Delete With Selection .Copy .Insert Shift:=xlDown End With