I have been having issues with a set of 3d blocks that I have copied from an older version of autocad. They were VAV boxes drawn using extruded shapes. The blocks displayed up until today when I noticed that they were turned into a single line. I attached a bunch of photos of the issue at hand. I tried copying and pasting the blocks again and it only would copy over a single line. When i would go into block editor it too was just a single line. HOWEVER, when I tried to move the object it would display the correct shape but revert to just a line after i placed it. No 3d objects from the original file will copy over to my current project. I then said screw the old VAV boxes and tried using the MEP VAV boxes, however those too failed to display in 3D when placed but displayed properly before I clicked. You can see this in all the pictures I have attached. Any help will be greatly appreciated!