Sounds like you may not have any of CA in the display area.
You may need to click on the CA map name in the drop down to make it active in the main viewing window. Yesterday was my first experience with it and I do not remember too much about the display since I was looking for how to load a mapset to the GSPr - the roads may be the only items in the overview map (for reference when zoomed-out). MapSource, like the GPSrs, will show increasing detail as one zooms-in and I would expect BC to do the same but do not remember seeing a numeric zoom display 'scale' in either BC nor MapInstall - most mapsets are designed to display the actual data beginning at the 2 or 3 miles zoom disolay level with the full detail dislayed at the 500 - 0.2 mile level.