Excel 2007 Track Changes problems
 

I have a shared Excel file which I created in Excel 2003. The worksheet has
hidden columns and requires my users to filter and sort the data. The
problems comes in for my users who have Excel 2007. The problems never come
up for users who have earlier versions of Excel. There are 2 issues:

1) The hidden columns don't get sorted when the rest of the worksheet gets
sorted.

2) The track changes function gets corrupted and identifies the wrong cells
as changed.

Can anyone help me? It's driving me crazy.

Thanks.
Auntie