That was my initial thought also but it was not
protected. What I had done was save the results of a
Agent Ransack directory search as a text file. I
converted that text file to an Excel file. I also
exported a table from Access into Excel. The "Agent
Ransack" and "Access" Excel spreadsheets had the
AutoFilter capability. However, when I copied the single
columns in both of those spreadsheets and pasted them
into columns A & B of a new spreadsheet, the AutoFilter
capability was grayed out. So, I decided to heck with it
and went about completing my task in a different manner.
At this point I have chalked up the graying of the
AutoFilter to "one of those odd, unexplainable things."