A hotfix to the hotfix will hopefully fix what is making eveeryone hot.

As discussed yesterday, there was a hotfix in place to limit the player numbers in Jita to reduce lag for EVE Online players, but luckily it was temporary. From CCP today:

"...a hotfix was deployed to Tranquility. The system cap applied to the server yesterday has now been removed from all systems with the exception of Jita. From today, Jita will still maintain a maximum player capacity which has been raised significantly."