We had an issue with earlier versions of firmware for the StudioLive Ai mixer where this was a problem. This issue has been addressed and functionality has been restored in Firmware version 1.0.5124 and above. To learn how to complete a Firmware Update on your mixer, go to the link below: https://answers.presonus.com/1126/studiolive-ai-mixer-firmware-update-via-usb-thumb-drive