The reason HMGP is trading in physical certs. stems from the DTC issue that is still not worked out. Once that is cleared up they will trade electronicly. The brokers need to transfer the shares by mail and it takes weeks instead of days for them to get paid so they just don't trade it. I'd recommend another account because this issue has been on the verge or being fixed for months now.
Take my advice with a grain of salt. (preferably many grains distributed around the rim of a margarita glass.) I am not a stock professional, trade at your own risk!