QPrinterPreviewDialog and QPrinter not showing and not printing some elements in qwebview pages

When i want to print(QWebView::print) page in webview (Ex. www.google.com)(using qprintpreviewdialog and load finished)
in linux printpreview dialog not showing some text on page but print everything on page.
in windows printpreview dialog shows everything but print empty page or just some elements(in www.google.com just prints buttons on page).

Tested Qt 4.7.0 and 4.7.1, both worked.just 4.7.2 has problems
Same problem can reproduce using qt browser in qt demos->demonstration