If the IMPACT icons do not show in AutoCAD you run IMPACT for AutoCAD Modules. Tick all boxes and click ok. 

Figure 3: IMPACT for AutoCAD Modules

Now when you open a drawing from Project Manager the icons should be back.

If the boxes were ticked to start with and it's still not working. Untick the boxes, start AutoCAD, close AutoCAD. Then open IMPACT for AutoCAD modules again, tick the boxes. The modules should appear again.

If this does not help, please proceed with this article CUILOAD