I am having the same issue. I launched a major product today, taught a webinar. Went in to send out a marketing email following the webinar and it is not working. I reached out to customer service and they offered no solution, no timeframe and no accommodation for their system being down, They have cost me sales tonight.
I am experiencing the same thing. It is also grey for me. I am also having trouble printing shipping labels, that page seems to be unavailable to me as well. From another post I saw on here, it looks like they are aware of these issues and working on it. Here’s to hoping they fix it quickly!