If you have selected on the myCRED > Settings page under “Ranks” to include rank in the profile header, then it will only show the rank title. myCRED does not include by default the logo (since not everyone uses it while a rank title is always used).
So if you have seen a rank logo, there are only two possible options:
1. You use the %rank_logo% in the template for BuddyPress Balance template or
2. You use custom code in your functions.php file where you insert the rank logo.
If your rank title shows but no logo is shown I would do the following troubleshooting:
1. I would first make sure there is a rank featured image.
2. Visit my profile and check if the logo IS inserted but hidden via CSS. The easiest way to do this is to either inspect the profile header via your browser or view the html source.
3. If there is still no logo, I would enable WP_DEBUG in the wp-config.php file and then visit my profile / reload profile page to see if I get any error messages.