Hello,
On my Raspberry Pi I am having the issue described here (describing the same issue in Ubuntu 12.04LTS):

http://bitcoin.stackexchange.com/questions/11829/bitcoin-erupters-not-stable-on-ubuntu-and-cgminer-3-3

Basically in 3.3.1 (or 3.2.1, 3.2.0) with 1 USB AsicMiner Erupter, on a USB2.0 hub all is good hashing around 333MHs stable. If I add a second stick (or more) hashrate jumps all around with all chips eventually getting SICK and restarting. Built following instructions and verifying prereqs.

I'm rebuilding an Ubuntu box to try to reproduce there.

Any tips on something I may be doing wrong or ideas on the problem?