This is not a question, just thought I would post since I had a hard time
figuring this one out. The caption of my workbook had the word [Group] at
the end of the title. As a result, the auto filter which I had configured
for the first worksheet was disabled. The cause of the problem is that there
were two worksheets grouped together as indicated by the word [Group]. The
solution is to simply press Shift + Control + Click each worksheet in the
group until the word [Group] disappears from the caption. Hope this helps
anybody that experiences the same thing.
-Leonard Martin