I just created a large, high resolution PDF aerial map of our refinery from our county's GIS service. In AutoCAD, I attached the images in a tile formation to cover the area I needed. Now, I want to use this as a base layer to true up existing plot plans for the facility. However, when I rotated the attachments to align with our drawing coordinates, their frames reappeared despite having turned the frames off. I tried regenerating the image to no avail. Any ideas?