I have a client who created a macro that applies different formatting to
columns in her spreadsheet. When she runs it on a new, blank spreadsheet, it
works fine. When she uses it on a spreadsheet created from one of our
proprietary applications (spreadsheet starts out html, not xls), instead of
highlighting just the one column, it highlights the entire spreadsheet and
applies the formatting to all the columns.

Here are some of the things I've tried:
1. Happens in both Excel XP and 2003
2. Saved file as .xls first, then ran macro (still happens)
3. Tried on different computers (still happens)
4. Copied content and pasted only values in new worksheet (macro works
fine - but there are other issues with doing that)

Any ideas on why the macro highlights all columns?