Reports received on IRC: People are having trouble creating accounts: https://meta.discourse.org/t/problem-creating-new-account/11896
OvermindDL1, I've already sent you a tweet, just posting here again for the record.
The server still runs when no one is connected, keep that in mind. I don't know what mods you are running, but one of them is gobbling up CPU cycles. You'll need to find out what mod that is.
FMP IS NOT FORGE.
Speak to ChickenBones, his stupid deploader is screwing things up again.
In general you need to make sure the version of FMP is the same on client and server.
We've recently opened a new community forum that may be replacing this one, and would like you guys to provide feedback on it, especially in regards to speed, usability, and more.
Here's the link: http://discuss.minecraftforge.net/
You'll need to create a new account, though it links with a few services if you want, more will be added later.