I had this problem a couple of years ago and could not find an answer. I open the CAD Block Management box on a new file with no drawing in it. The Cad Block Management box shows all kinds of electrical blocks and I cannot delete them. In fact when I select the libary object the wrong 2D object is associated with it. Is this a bug? Has a patch been sent out? How do I correct this? Thanks for any help. I have 5x