I have a macro that contains the line:

..Cells(irow + 2, 5).FormulaR1C1 = "=R[-1]C*R[-2]C3"

The first time a worksheet is created and the above code is executed
when irow=15, the formula produced in E17 is "=A65536*$C65535". If
I run it again, the code executes properly and cell E17 gets the
formula "E16*$C$15". Does anyone have any ideas? I've exhausted all
mine, and have concluded it's an Excel bug.