Inconsistent album artwork display in iTunes on Windows

The two images I attached here show the problem, but to spell it out: the album artwork is there when I go to Album Info as you can see in the first image, but it doesn't consistently appear in the list view or whatever it's called... I can run iTunes and see an album cover in the list, then close iTunes, and it may or may not appear the next time I run iTunes. I only have about 120 albums in the library, and all of them have album artwork attached, but it's absolutely random which choose to display their artwork and which don't every time I run iTunes.

I share the same iTunes Library between two Windows machines (one being a media player, where the Library loads locally, and one a workstation where I have a mapped drive pointing to the shared drive on the media player machine where the .itl library file and all the .mp3s are stored. The same thing happens on both.. and even THAT's inconsistent! I can run iTunes on the workstation and on the media player, and if I remote desktop to from the former to the latter, the same album will display artwork on one but not the other, some albums will not display artwork at all, while others will display it on both machines. If I exit iTunes on both machines then run it again, I get the same, but with different albums; repeat, and it's a mixture of the first two runs.

This has been plaguing me for years, and even had me doubting my own sanity.. "maybe I just didn't add the artwork, so let me add it.. umm.. add what, it's THERE already!!" How can this be??

Please don't bother with hedgedoctor solutions like "restart iTunes", "delete and add the album again" or any of that. If this is simply broken and can't be fixed, just tell me so I can move on from iTunes.

Thanks.

[Re-Titled by Moderator]