The problem occurs over WiFi to Chromecast 4k but also to Chrome on Mac OS running on the core machine.
This problem occurs on displays regardless of the connected audio device (which are all working fine).
660 artists, 1,673 albums, 24,933 tracks
Something has changed recently and now images do not display for approximately half of artists. The problem is specific to artists, for example, k.d. lang does not display whereas Kate Bush does. These are all local images, not Roon images. The problem is not with the image itself: swapping images means the image of k.d. lang appears against Kate Bush, whilst the image of Kate Bush does not display against k.d. lang. The problem is consistent across artist and compilation albums: the image for Kate Bush always appears whilst the image for k.d. lang never does. All artist images display reliably on the Core Machine, iPad and iPhone.