OSA platform has been upgraded to 7.0.
Attempt to change the brand skin to one of the new skins (e.g. "skin-blue" or "skin-green") does not bring any difference.
New skins come in new format, fully based on APS 2.0 standard. After upgrade to 7.0, the new skins format should be enabled in order to become available.
Enable the default CCP mode at System > Settings > Enable/Disable CCP v2 to make the skins available.
Take into consideration that old skins should be re-packaged to become APS 2.0 certified and compatible with the new OSA user interface. See the following article for more details: