Eeek!
Okay, I know what's happening (it's got the wrong resource pack). I don't know HOW it happened, but it's a rebuild fix, not code. I put as many assets as possible into resource packs, so they can be side-loaded; that reduces the memory load of the application, and also allows me to build the WebGL build cleaner. The problem is that the resource packets are pre-optimized for each platform, so the Android resource pack won't work for the OSX build, etc. This seems to be playing games with my build system; 90% of the time it works, but that means it screws up 10% of the time.
I'm rebuilding now; will edit this post once my hamster-powered internet uploads to Mega.
Edit:
Phoeniix : updated OSX Mega build here
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It's got the various fixes from yesterday + rebuild OSX addressable data packs. It's an interim build, so I'm not going to destroy my poor wifi uploading it to all the mirrors; I'll do that once I'm done with the other fixes