Did you ever created a block with attributes and wanted to amend them? AutoCad doesn’t update your changes to a block. I usually was creating a new block from the beginning to have it like I want. But there is a way – easy to remember – I call it Batman. You need to type a command BATTMAN. It opens Block Attribute Manager. All you need to do is to choose your block from the extendable list and click “Sync” button. Changes you made to your block will be implemented.
(Don’t ask me why it’s not done automatically after block amendments!)