Group Data

[Steve]

Hi,

I am trying to use the Data -> Group and Outline -> Group
command, which I have been able to use successfully on
most of my sheets.

However, I am trying to use it on one of my sheets (which
follows the same formats as the other sheets) and Excel
freezes when I try to group the rows.

Is there an obvious reason it is doing so???

Many Thanks,

Steve.