I've had a similar problem with cgminer 3.3.2
There's a 3.3.2? I'm still using 3.3.1, which is working great for me with USB Erupters. Of course I only have 15 of them with USB 2.0 Hubs.
Opps I think I meant 3.3.1, but mostly I meant latest master from github (805672fb51f4219e8c5848dc761509d32bffde9f -- I think it identifies itself as 3.3.2, sorry I forgot it wasn't released yet). I tried master from github first when I couldn't get 3.3.1 to work. I was about to blame the hub when I decided to try building 3.1.1 as a hail mary.