[Longtime Collector]

However with the genre node (songs grouped by genre) I am shown * All Artists, but clicking on this does nothing.

Confused what you are doing @Longtime Collector as it is not possible to group songs by genre. The grouping options for filter type music nodes or smart playlists are very limited (albums group by year, artists group by genre), so you had best provide the node definition you are trying.

Thanks for getting back. I've included the "working" version of my years node as well (it gives me *All Albums which is clickable).

<node order="10" type="filter" visible="Library.HasContent(Music)">
    <label>135</label>
    <icon>DefaultMusicGenres.png</icon>
    <content>songs</content>
    <group>genres</group>
</node>

<node order="60" type="filter" visible="Library.HasContent(Music)">
    <label>652</label>
    <icon>DefaultMusicYears.png</icon>
    <content>songs</content>
    <group>years</group>
</node>