I'm really loving OXCE+ ! However, I love Area 51 too, but I'm having problems making both play nice together:
Some of the A51 sprites are horribly corrupted. As best I can tell, they are proper pngs/gifs, that appear fine in Preview in the OS. But in-game, they show up as jagged scrambles. Not all of them, but military-base soldiers, or easiest to check is the smoke grenade in inventory/on-hand.
I'm using a manually compiled OXCE+ on macOS. I confirmed a manually built standard OpenXCOM build is fine, displays sprites fine.
Any ideas?