I can't get the PI / MinePeon (v6-11) to work with the USB3 hubs (known issue, iirc) - but I do have a http://cubieboard.org/ cubieboard, running Linaro which has a version of cgminer compiled on it (one of the later 3.2.0 releases), which runs the Anker USB3 10port hubs fairly well.  cgminer seg faults, and has to be restarted every day or so, but it is running 36 of the AMUs @ ~50-60% cpu.  The most solid environment I've had w/the 9x AMUs in the Anker hub, is Ubuntu 12.10 on a laptop, running cgminer 3.1.1 - that's run for days w/o so much as a hiccup.

oh, and thanks so much for MinePeon - it's awesome!!