location block in IE 7

I have a problem using the location block in Internet Explorer 7 - it shows the gmap not correctly – only part of the map is showed, the rest is white. When I change zoom in my computer screen from 100% to 150% full map is showed but with wrong the center of the map.
This did not happen in Firefox and Opera - the map is showed up correctly without manual changes on computer screen.

When I use garland theme, the map is showed in IE, Firefox and Opera without problems.