Place this
**IMAGE_3DOBJECTS
[3D Objects]
[acad(Box3d,Box3d)]^C^C_ai_box
[acad(Pyramid,Pyramid)]^C^C_ai_pyramid
[acad(Wedge,Wedge)]^C^C_ai_wedge
[acad(Dome,Dome)]^C^C_ai_dome
[acad(Sphere,Sphere)]^C^C_ai_sphere
[acad(Cone,Cone)]^C^C_ai_cone
[acad(Torus,Torus)]^C^C_ai_torus
[acad(Dish,Dish)]^C^C_ai_dish
[acad(Mesh,Mesh)]^C^C_ai_mesh
Under the
***IMAGE
section in the ACAD.mnu file
Then delete the ACAD.mnc & ACAD.mnr files
Restart ACAD & it should work for you.