If reinstalling doesn't help, try this. The problem is not with the album cover art so changing it may or may not help for that individual album. First, I tried clearing the cache and clearing the data and that did not work. Then I tried reinstalling, that didn't work either. So if this last step doesn't work, maybe try doing the things I did up until now, then try again. To start, remove the app from the recents app drawer and force stop the Samsung Music app. Next clear the cache. Now, in your My Files app, make sure "Show hidden system files" is enabled in the settings. Go to the path "Internal Storage/Music" and you will see a hidden folder named ".thumbnails" which holds all the album covers. Simply delete that folder, start up Samsung Music, and the app should regenerate the folder along with the album covers (unless you actually did mess something up with the album cover tag in the files themselves). Hope this helps.