Hi @Lon_Baugh! This could be connected to the library/non-library issue. You can only “heart” a library version of a track. A track can be in your library… but that does not mean you have that library version in a playlist or in your queue… so, you can’t “heart” it there. When, however, you go to My Library > Tracks or you go via Album view, you can find the library version there and “heart” it there. Complicated? Yes. Too complicated? Yes.
If you want to know the details: Solve the library/non-library conundrum and all the complexities it creates for tagging, focus, playlists etc