Hi. The Curios slot background texture is not found when Minecraft loads and has a Minecraft "missing texture":

But, if you reload the resources (either before or after entering a world), the texture is displayed correctly:

I believe the problem is in com\traverse\bhc\common\BaubleyHeartCanisters.class where you load the texture from slots/empty_heartamulet instead of textures/slots/empty_heartamulet.png.

Alright I will take a look at getting a fix out tonight