There is a confirmed bug with viewing Google Maps embedded using Internet Explorer 7.

One user reported the issue in the Google Maps Help forums, sharing a screen shot of the issue. In short, when you use the standard Google Maps embed code and try to view the map on the page when using IE7, it will show a dialog menu that the map is loading.

Here is a screen shot:

Daniel from Google confirmed the bug saying:

Forum discussion at Google Maps Help.