A significant architectural upgrade is taking place today. Essentially all servers are being switched over to a new system to ensure scalability into the future. Without getting too technical, the new servers are a lot more powerful, more RAM, and so forth.
To do this, however, requires taking the panel down for a while and putting digests into cache only mode. If your digests are being loaded regularly, you should notice no issues except slow updates today (only). If your digest shows as empty, please wait as we are striving to complete the work as fast as possible. In theory it comes down to how fast the DNS changes propagate for you as the new system is all up and running fine :)
Updates will be posted.