Quantal x86 install inside VirtualBox (quantal amd64 host) stops progressing, any ideas?

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http://askubuntu.com – I've tried several times to install Quantal (i386 and amd64) inside VirtualBox (4.2.0-80737~Ubuntu~precise) and it hangs at "Retrieving package 31 of X" each time. This is well after I've enter all the info and am just waiting for it to finish. I've tried purging and reinstalling VirtualBox and also different ISOs (daily, beta2, etc) all without success. Has anyone else seen this and better yet, have a fix or workaround for it? EDIT: I originally said "hang" but I can still interact with the installer, click on stuff in the indicator bar and change the page on the scrolling advert-like box (HowTos)