Server is down, plain and simple. It went down twice consecutively, with the latest occurrence happening around 5 PM EST (15 minutes ago).
On the first down, it looks like chests/furnaces (at least in unloaded chunks) were saved successfully before the initial crash. However, it did rollback every players inventory to the last saved state. This resulted in many lost resources, because if you took anything out of your chests and left the location, the chests no longer have the items, and neither do the player.
On the second crash, the server seems to be failing to come back online on its own.