Enabling JavaScript in QWebKit 4.7 over Symbian

Question

I am trying to build a Symbian (S60 5th ed.) application with Qt 4.7.0. My application contains a QWebView widget. In Qt 4.6.3 the web view was running JavaScript perfectly. However, once I upgraded to 4.7.0, JavaScript is no longer working, not even in the "anomaly" browser demo.

I've tried to set JavaScript explicitly, but in vain.

QWebSettings::globalSettings()->setAttribute(QWebSettings::JavascriptEnabled, true);
ui->webView->settings()->setAttribute(QWebSettings::JavascriptEnabled, true);

Both calls did not work, and calling testAttribute(QWebSettings::JavaEnabled) still yields false.

What can I do to enable JavaScript in QtWebKit on Symbian?