I am updating a previously created drawing with dynamic blocks and notes. When I bring in objects from the previous drawing and then delete them, a whole slew of blocks are created with the prefix *U or *D followed by a number. While I can purge these easily, it will be a pain when we insert the dynamic block into another drawing. If the block is exploded and then deleted, the new drawing ends up with these "phantom" blocks as well.
So the question becomes, why are these being created and how can I get rid of them? I am working in 2009.
Apologies if this has been addressed previously. I'm not sure what to call these blocks.
Lisa