I've not Rooted the Butterfly, pure stock. Didn't do anything, just plugged it in via a USB OTG cable (it MUST be an OTG cable) and that's it. I had already set the Glacier NOT to charge off a USB audio input, and USB Debugging was on by default on my Butterfly.
Apart from possibly not using an OTG cable the only reason I can think of for it not to work on your Butterfly would be that your firmware is slightly older. There was a very recent firmware that added USB OTG support, mine shipped with it, but those being sold in Asia for the last several weeks may not have shipped on that firmware.
Thanks for the info. I suspect my cable is not OTG capable and I have ordered one online. Hope it will work this time. Appreciate your input.