I have a document where I can't change the shapes, I get the message
"Shape protection, container, and/or layer properties prevent complete execution of this command"

So I added Developer tab and I can see that the shape has no protection. The Layer properties show that the layer is not locked and yet I can't delete or ungroup the shapes. I can add more shapes but even if I make the copy of existing shapes I still can't change them.

It's driving me crazy

Any ideas please?