Hi there,
A few quick questions for me to try and understand better what is going on:
* Did you check the checksum of the downloaded ISO (SHA1SUM should be: 914eebd1ae64015d4d8b2281143caa466d44b280; run "shasum" on OS X to calculate this)?
* Can you open the ISO with other tools (like Disk Utility)?
* Are you running the latest version of VirtualBox?
Regards,
Clifford
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