same thing here... no preview and the folder after download are empty.
these are for google map and google map maker. I didn't try other maps except openstreet which works perfectly.
by inspection, I found that there are slight difference in the url of files in the preview with the webpage, like sample below.
from http://maps.google.com/:
http://mt1.google.com/vt/v=w2.99&hl=...876&z=11&s=Gal
from gmdl:
http://mt1.google.com/mt/v=w2.99&hl=...876&z=11&s=Gal
from these sample, the actual difference is the letter "v" from /mt/ of gmdl.
and for map maker, the urls are quite different...
from http://www.google.com/mapmaker:
http://gt3.google.com/mt/n=404&v=gwm...583&y=876&z=11
from gdml:
http://gt2.google.com/mt?n=404&v=&x=583&y=876&zoom=7
