Be advised that with the release of MAME 0.212, the ability to turn off individual layers of artwork has been removed (Enable/Disable Bezels, etc... see screenshot below) as part of the current work being done to update the artwork system in MAME.
This is not a bug; this is working as is currently intended.
Any discussion regarding this, please post a separate topic in this forum, as this post will be stickied and locked as an informational message only.
[ATTACHED IMAGE - CLICK FOR FULL SIZE]
RELAX and just have fun. Remember, it's all about the games.