Which charts did you install?
If they were vector charts you might need to go to the chart menu and select Jeppesen or Navionics under the vector tab. There is a selection for chart database and the default is HOs S-57. If you downloaded a Jeppesen or Navionics database they won't appear unless selected.
In addition make sure you have selcted vector (or raster) on the Roto-Key.