Problem with map displaying

I'm using google maps api, and have a map on my web-page.
Sometimes, when i leave page (minimize browser window, or select
another tab in browser)
a part (bottom right corner) of map becomes hidden (look at screenshot
http://work.vokrugsveta.ru/screen.jpg )

This error occures not only at my page, but in a few another web-
applications i see.
Is it known problem?

If you need i can give access for my application to you.

Sorry, for my english =)

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