I just updated the server to a Spigot 1.7.9 build that supports 1.7.2 - 1.8 clients. This means we are transitioning to UUIDs, you can log in with 1.8 client, but no new 1.8 items for now.
Side effects:
- achievements reset
- you may have to register again
if its says you are not whitelisted tell me.