Where are you seeing this? Maybe it's an error on their side?
It's time to panic?
It was on blocktrail. It looks like it was fixed, so there are no problems.
bitcoind, or bitcoin core (bitcoin xt?) w/lots of RAM
Why would you use Bitcoin XT? You do not know what bitcoind is?
Read more about it here.
So I get that this may be someones intention to stress test the network, or whatever.
As someone who has only used a wallet on a mobile phone can I ask what these numbers they keep posting mean and how anyone would actually get bitcoin from them?
Those are private keys. Each address has a private key. You can import the private key (i.e. the address) to (almost) any wallet once someone makes it public.
Ive sent some transactions using coin control.
Yes. It works if you let it work in the background at first, even though it looks like it is not responding.