Have run into a crazy problem. Have a macro that scans selected cells and,
if the content is a string, does a string manipulation. However, have
discovered that if the content is a certain type of string, VBA goes into
orbit.

Essence of situation: Select a series of cells in a pivot table. Cells
format is General. Execute a loop: For each cell in selection, if
typename(cell.value) = "String" then cell.value = "0" & cell.value.

Typical string data is <533: Then Text. Code works fine to make this
<0533: Then Text. However, when data is <715: 1.2, cell.value tests true
as string, but cell.value = "0" & cell.value causes a cell value of
<0.496541666666667 instead of the intended <0715: 1.2, is still format
General, typename string, and the worksheet is wacked out and VBA code jumps
out of the sub and starts executing in other subs that aren't even
referenced in it. End up having to use Task Manager to kill Excel, then
start over. So, what in the world is going on??

Win XP Pro, Office XP, both with all updates.

Thanks in advance for any ideas!
George