We've seen some users reporting inability to send loot to Borderlands 2 via LootTheWorld. Our team is aware of the issue and are working on a possible resolution.
For the future, keep an eye on our forums (forums.gearboxsoftware.com), Twitter (twitter.com/gearboxsoftware) and Facebook (Facebook.com/gearboxsoftware) as well as GearboxSoftware.com -- those channels are updated whenever we have news or an update to share.