This week I actually encountered my own issue with AutoCAD and the Raster Design tools, the ribbon tab was loaded with all of the buttons, however when I went to use the command, I was presented with the following error, regarding the aeciibui58.arx:
To fix this, open your AutoCAD options, Files tab. Under Support File Search Path, Add and then Browse to C:\program files\autodesk\autocad raster design 2015
Apply and Ok, your raster design tools should now work as expected!
When presented with any errors regarding AutoCAD not being able to find certain files, it is always recommended that we check the paths that AutoCAD is using.