Bang Symbols & Missing Artwork

Hello world,

anybody have a fix ???

fig 1

fig 2

AAC files are stored on a time capsule.

Bang symbols appearing adhoc when I start up.

When bang symbols appearing against first track on an album artwork is not rendered (fig 1).
Artwork is rendered once first track is played / opened (fig 2)

NOTE other album tracks have bang appearing.

This is a major niggle when you have hundreds of albums.

Is there a way I can get rid of these bang symbols easily or prevent appearing??

cheers!