Sorry for the long wind...
Normally I just load up MusicBee and select all artists and play all tracks randomly, gives me a good variety that way, so if I am not describing this correctly, a thousand pardons.
There is no missing Album Art in my library. In the "Now Playing Layout Configuration" > show track details panel > "Show Artwork above Fields" is selected.
Applied this patch, it worked but changed how something else worked. When loading MusicBee all the correct album art shows in the "Albums by Album Artist" but in the "Track Information" the Bee with the ? mark shows. Playing random tracks (or in any order) shows the same Bee icon.
Right clicking that icon shows that there is a check mark at Image One:Album Cover. Reselecting that returns the correct album art only for that track.
Looking at Albums by Album Artist shows Album Covers, when selecting single tracks the Bee icon shows again in Track Information. When right clicking the album, the correct album art shows in the "Track Information" then when selecting play now, the Bee icon comes back.
Double clicking the album in this view brings up the single album and associated tracks, when playing one of the tracks, the correct album art is displayed instead of the Bee but when returning to the previous display the album art is again lost.
Am thinking it is looking for an "Artist Picture" (since that is what the patch was for) in the track information and I do not have any artist pictures to show but I cannot seem to find where to turn this off in order to restore the "Album Art" to the individual tracks. I must be missing something.
Posting this so others can see what may happen if the patch is applied. It is really not a priority for me seeing "Album Artist" photos so my repair was to restore the MusicBee.exe and MusicBeeBass.dll from 2.0.4663 to get rid of the "Album Art" not showing in individual tracks problem.