Ultimate Branding plugin's assets are not loading over mapped domain (Incompatibility with Domain Mapping plugin). you can find detailed description below.
Ultimate Branding is using 'WP_PLUGIN_URL' constant for getting plugin url so if anyone set value in constant 'WP_PLUGIN_URL' or 'WP_CONTENT_URL' using wp-config.php then domain mapping will not replace URL to mapped domain. so assets of ultimate-branding plugin are loaded over old domain ( sub-domain). You can user functions for that so it can be pass through filter. Its not bigger issue but its really important when site accessed over https:// and http://. can you please consider to resolve it in upcoming release. maybe this issue reported earlier.