Album Art in Library View

[srinisr]

Just started using PerfectTunes - issue is that some of the album art does not show in the Library view - however when I click a specific album the album art is displayed.
FWIW when I load the library in my music player (audirvana) all the album art is present for the entire library.
Would appreciate suggestions on how to fix this.
Thanks!

[Spoon]

We would need one track from one of those albums and the art if held only externally (such as folder.jpg), upload to somewhere like dropbox and personal message me a link.