I have noticed that I am getting this message when I am opening some older projects and architectural files created with systems older than ACAD 2007:
If I cannot download the object enabler for the objects that are contained in the drawing, I will always get this message. No matter what option I pick at this point, the next time you open the drawing, I will see this message again.
To make sure these objects are shown every time, type in the following command:
Set this to “1” to get a graphic display of the objects in question. If you set it to “0”, then the graphics will not show. If you set it to “2”, then you will get a bounding box around where the object should be.
Now to never get that warning message again, type in the following command: