There have been some posting about this problem, but I've never seen a
cause pinpointed. Dave Peterson suggests a couple of fixes in the
following thread:

http://groups.google.com/groups?&thr...E07B%40msn.com

fhayes wrote:
Has anyone else ever experienced this?

Many times (not every time) when I use AutoFilter on a list, the
dropdowns are not visible. However, when I go to Data, Filter it shows
that the AutoFilter is active.

Sometimes when I close Excel and re-open it corrects the problem.
Other times it doesn't.


--
Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html