[dkoh]

It is not just the source files that need moving the clear art, but what is in texture cache too. All I can suggest is that you look a lot closer at these images or better still replace/remove them (and from cache). Are these same images shown when using Estuary?

I checked them and there didn't appear to be anything funny going on.  They're just 1920x1080 artist backgrounds.  I'll delete them and let them get re-scraped. 

FWIW, this machine has been working fine for several previous Kodi/XBMC installs and I've been using Nox Silvo since it came out.  My music library increases gradually (usually a handful of albums per month), so it's not like I just doubled it.  I never had this problem with 17.x, but it's been consistent with 18 RC4(?), 18.0, and 18.1.

Oh man... now that I think about it, the only new noteworthy variable is the release of Artwork Beef in 17, and AB didn't even handle music until 18, which is where the problem showed up.  I believe AB also tries to do a bunch of pre-caching as well.  I'll uninstall AB and see if that makes a difference.  Is simply removing it through add-ons enough to ensure it's not interfering?