When your list has many formulas, or if a cell in the list is changed
after an AutoFilter has been applied, the Status Bar may show "Filter
Mode" instead of a count of the visible records.

The following MSKB article has information:

The AutoFilter status bar displays the "Filter Mode" message in Excel
http://support.microsoft.com/default.aspx?id=213886

And there are a couple of workarounds he
http://www.contextures.com/xlautofilter02.html#Count


wrote:
My autofilter suddenly stopped displaying the number found in the lower
left corner of the spreadsheet. It will display the results based on
the search, but the number found is missing. If I right click on the
word Filter Mode, it has SUM checked. This seems to happen to most of
my spreadsheets. How do I fix the problem and second why is this
happening?

Thanks,

Paul



--
Debra Dalgleish
Contextures
http://www.contextures.com/tiptech.html