mpatti07 - as Edworld says, all the settings that show look right. However, you don't have cases showing on your posters. Without that, this effect won't work. Go back into BD/DVD Cases settings. Make sure you highlight one of the case options represented by icons on the left (other than "No"), hit return to select it, then hit escape. Otherwise it is hard to make sure that choice sticks.
Here are the BD/DVD Case Settings
Here is an example. See Avatar has a case. Back to the Future doesn't because it s a movie set.
If that doesn't work, look at the good advice Oddsodz gave you, make sure the artwork is local, etc. Actually, the fact that you don't get the discart showing in the movie info page either, suggests that you may not have the disc.png in your local movie folder.
I'm not sure why the focus on addon "content", but here are my Program addons. And yes, I get the error on startup from the extendedinfo script.