I suspect this is another endian issue, actually. asm.js code
will run on PowerPC, it just isn't accelerated. But if the code
makes endian assumptions, it won't run correctly and we have
uniformly seen this problem with asm.js because of Emscripten.
The thing with mega.nz is: If the file is big it will take a long time to "transfer" and then to "decode" the file (whatever mega.nz is doing at this stage, in theory is should start downloading right away). "Decoding" means the progress bar will stay at 99%; for a 100 MB file this may take several hours with only little processor load on the client side. I've had a 550 MB file sitting there over night for at least 9 hours, but it downloaded eventually. Again, I have no idea what mega.nz is doing there and why it takes so long, but it does work if you're patient.