Good morning.. [insert Yawn! here]

I'm going to sound dense. Apologies in advance.
Is it true that we cannot use Google Earth with Plan-G V3 ?
If not can you explain to me how I should use the KML button?
I have downloaded a KMZ but even after selecting SHOW, the map remains the same.
Should I be seeing an overlay? Who has the best libraries for KMZ/KML files?

Thanks


Tailspin  KSAC