We've unlocked the vox-l artifact on your account -- would you try testing the badge again in the simulator on the badge page?
If the problem persists or if you can't see creatures in the simulator as well, it may be that there's an update for vox-l that our Development team needs to implement. If that's the case, they'll be able to do so on Monday. I'll keep you updated on this
Meanwhile, badges should still unlock and you should be able to test mods in minecraft. Let me know if you're having trouble using learntomod with Minecraft and I'll be happy to help.