Bob, 4.8.4 is the Mac version, this issue concerns the maps that are installed under Windows (to be precise: only those maps that are registered in the windows registry with an installer or .exe file) . So AFAIK no problems on Mac OSX.
There are also no issues if you run the latest Basecamp/Mapinstaller with the gmap versions (the so called Mac version on garmin.openstreetmap.nl, but those can be used on Windows computers as well).