When printing to a printer via QWebFrame::print(QPrinter *) the printer just prints blank white pages. When printing to a file (ps or pdf), everything gets printed fine.

See the attached testcase.

Printing anything else works very well, so for that reason I first posted this bug at the webkit bugtracker (see https://bugs.webkit.org/show_bug.cgi?id=61271), but it seems not to be a webkit issue.
The problem is known to exist in Qt 4.7.2/3 as when everything worked fine in 4.7.0. No problems with this on linux at all.