With this patch to html4.css applied, release build of subsequent revisions on Windows all crash when loading a web site in QtWebKit4.dll!WebCore::StringImpl::StringImpl after parsing the default CSS. http://trac.webkit.org/changeset/41041/trunk/WebCore/css/html4.css Debug builds are not affected for some reason. Qt is 4.4.2 without Phonon (so no video support).
Try a full (clean) rebuild. Re-open if still valid. Thanks