On the options page for this plugin, I checked "Serve Avatar as Fallback:". But, I also use the Gigya plugin to allow people to register via their favorite Social Networking site. This was causing the members profile to take a small avatar and display it at the large size members use for uploading photos; for me 600px.
So, I went into the plugin and removed line 138:
$width = $height = get_option($photoSize == USERPHOTO_FULL_SIZE ? 'userphoto_maximum_dimension' : 'userphoto_thumb_dimension');
This allows the plugin to show the social network avatar at its' correct size.