I have created a spreadsheet that uses an auto filter. It works fine on my pc and on some others, however some friends say that whilst the auto filter box is visible if they select it nothing happens (no drop down list).

The autofilter is in an unprotected cell, the worksheet/workbook is protected but not a shared wook book. One of the users gains access to the filters if he upprotects the workbook only.

The problem does not seem to be related to version or operating system being run.

Could it have something to do with a general setting in excel, or anyone else come accross a similar problem.

Secondly (maybe related?) from the 'DATA' 'FILTER' menu in the protected sheets/workbook the autofilter is checked and greyed out but the advanced filter can still be selected. If one of the users selects the advanced filter it over rides the previous auto filter, then i need to unprotect the sheet and re-protect to use the autofilter again. How (if possible) can I prevent them selecting advanced filter to stop this problem occuring?

Many thanks if someone can help....
Ron