A client has a very large excel workbook with a lot of macros to hide and
show data for different reports. This worked fine in excel 2000 but now they
have upgraded to 2003 and it doesn’t work any more. I have identified that
the two lines that are having the problems are

Cells.EntireRow.Hidden = True
Range("Something").sort key1:="somekey”, order1:=xlAscending...

Sometimes it will just stop when it reaches these lines and if you run it
again it will work. Other times it doesn’t matter how many times you run it,
it wont get past either of these lines.

There is an error handler around these lines but no error is thrown, it just
stops. I have a feeling it might be something funny with the data in the
workbook but I have no idea how to check or what could be causing it.

Any help will be greatly appreciated. Thanks