Hi
I experience the same problem as the original post, but
have noticed that it only occurs if I do intermediate
saves while editing my spreadsheet. Once I have saved, I
need to select the whole worksheet, turn off auto-filter,
Unhide all rows and columns even if none have been hidden.
I have to do this at least twice before turning Auto-filer
on again before I can use the drop down lists to re-filter
my data.
There doesn't appear to be anything in the abiut this in
the Knowledge Base.
Regards
GRAPL