I have obtained some boundary maps and have joined population data to the corresponding areas using the join tool in ArcGIS. Before the joining, I first checked and edited both the boundary map and population data to synchronize the two sets of data.
For instance, an area A may be represented by a population X but may have two polygons. In this case I merged them into one. Editing produced community boundary maps with their matching population and population density. I then exported the population data which was in Excel/CVS (comma delineated) into a GDB to obtain marching OBJECT IDs. Then continued with the join which was successful.
Now my problem is when I tried to generate a population density map using quantities the entire layer will vanish from the workspace. Zooming to layer does not bring it back. I am not sure where I might have gone wrong. I have tried checking geometry for errors and had corrected the errors, I had matching coordinates. But still the same problem.