This is a cached map from the software: ogmaps
Please look carefully at the tiny shades below the address bar in the main window here.

On once clicking the minimize/maximize button, it gets showed up fully. Tested on firefox, and google chrome.
Can’t say that this is the browser problem, since when I loaded this cached map on the Qt widget, I still had to click the minimize/maximize button, to get it gets showed up fully.

The html for the map is too long to be posted here. If there is any relevant section that you know of, then please tell me and I’ll post it here.
EDIT 2
Finally I have managed to upload that html code here: http://code.google.com/p/earthhtml/source/browse/trunk/ogmap.html
Please have a look about the div tags.
Although this may seem like something trivial, it worked out for me. I had the exact same problem (among other GM problems) using GMv3 and couldn’t figure it out.
min-heightto the div containing the map (with!important)max-height & max-widthsfrom the CSSThis fixed the ‘small map’ problem plus an additional problem I had with the GM pins and infowindows.
On top of that, make sure that there are NO divs with a high
z-indexon your page, as GM will resize the containing div not to interrupt with the top div. Another div with a higherz-indexwill also mess up the map and make the height and the width go crazy.I hope this works as good for you as it worked for me. If not, good luck!