As I have try is not possible because the file  is SHARED.

The macro  to "Unfilter" is in the personal file.
I have made  an icon in the formatting bar and I have assigned the "Unfilter"
macro. Like this it works very well with:

> Unprotected sheets  in shared files
> Unprotected sheets in non-shared files

In my opinion the problems  is because the file is a shared.