Are you using the Layer Manager or the Datacad menus to delete the layer? There is an issue with the Layer Manager related to deleting empty layers that DCLLC is working on. If you are using the Datacad menus might be something in the drawing. Have you tried a repair or purging the file that has the issue?
Thanks! - Josh Do. Or do not. There is no try. Josh's Digital Downloads is come back online soon. Stay tuned. (soon is a relative term)
Are you using the "Keep Layers Manager Open" option with the layers manager? If you turn it off, you should be able to delete layers using the layer manager. I have had the same problem with the layers manager.
Arthur Wood
CADD Manager
EH Danson Associates
St. Johnbury, Vermont