marketpress - authorize.net not showing in gateway options

authorizenet-aim.php is in gate way folder but not presenting as a payment gateway option.

WP 3.14 multi-site install using subdomains with supporter activated - wpmydev membership plugin installed but not activated.
BP 1.28
MarketPress 2.1.3

I've acvtivated Marketpress on a sub domain. 2checkout, google checkout (beta), moneybookers, & paypal express are showing up.

I've deactivated & reactivated. Reloaded. Tested on WP 2010 theme.

Any ideas?