Goto www.wsj.com. Boom. ASSERTION FAILED: d->m_doc->parsing() (/Volumes/Whopper/WebKit/WebCore/kwq/ KWQKHTMLPart.mm:736 void KWQKHTMLPart::addData(const char*, int)) I verified the problem comes with the recent fix to http://bugzilla.opendarwin.org/show_bug.cgi? id=3968 - REGRESSION: top frame only loads at banking site - http://www.skandiabanken.no + if (locationChangeScheduledDuringLoad) { + stopLoading(true); + } The first line is clearly wrong because it's testing a non-zero constant. MJS also doubts that stopLoading is the right thing to call to cancel the main resource load (consult with him for more info).