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I have the same intermittent problem with DW CS4 on a Mac. The same thing happens with DWUser v4 Flashslidehow, so I'm betting that this is a Dreamweaver issue. We still need to find a fix though...
I say "intermittent" because just now I opened a site, then opened a page with a Google Map. The icon shows, and allows me to select the "Edit" button in the Properties panel. But then I open another site and there's a big empty space where the Google Map placeholder image should be, and the Properties panel does not show the "Edit" icon.