[Vibraphon]

Somehow I can't manage to recall saved filters successfully.
My steps are:

• [Create filters] using custom2 "C-Version"
  
• [Save as] "C"
  
• [Create filters] using custom2 "Bb-Version"
  
• [Save as] "Bb"
  
• [Manage Filters]: both filters are listed
  
• [Open Filters]: both filters are listed, but the selected filter does not work
  

Did I miss any step`?

Is it possible to redefine the predefined filters (Search, Source, Key, Collection, Diff, Genre, Rating)?
Actually I only need the filter Search: "All Fields" for the title search and a non-existing filter for switching (custom2) between the C, Bb and Eb versions. Together with the tabs for [Setlist], [Recent], ... all possibilities I need are defined.