SpriteItem#interact seems to be broken (oldschool)
Bank#open doesn't work on chests
ItemDefinition seems to be screwed upon Bank#open, this happened when I called Inventory#containsAnyOf:
http://paste.strictfp.com/40090/14acdb76f72f0c96f7df5cda3cf68bf9
Another error upon simply calling Item#getDefinition (with null checking that the item isn't null and its id isn't -1):
http://paste.strictfp.com/40091/d80c99a8b35ecec83e6dee27fdcce497
Also in the interface explorer, it lists "Widget #" -- I'm assuming since packages were changed from *.widgets.* to *.interfaces.* you'll want to change it to "Interface #"