In what way are you trying to export things? Are you doing it in your own server with a loaded build or something different?
Add-ons or just the main BL folder?
edit: ok you have to OPEN the Poxel.zip
See, that's why I'm not releasing it as an Add-On. People who don't
read.
edit: Is it meant to make most of my bricks invisible?
I just ported it. Perhaps there's something in v12 which isn't working right.