This is a known issue and we're in the process of fixing it. There are a few FAQs on how to get the looper running on your Echosystem and Reverb. So if you are having issues with the looper, try the setup process again in case something went wrong.
SD Card Requirements for Looper and Firmware Updating
Instructions for using the V30 multi-track looper on the Echosystem and Reverb
I cannot get the looper to work with my SD card on my Echosystem or Reverb