The libqtwebkit4 library that e.g. libkdewebkit5 uses is old and has several bugs. Most recently I noticed that the upcoming ownCloud 5 wouldn't work at all with rekonq and konqueror/webkit because it doesn't understand modern Content-Security-Protection headers. Neither did the *old* versions of Safari, so we had to change the SCP headers to old, non-standards compliant headers.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: libqtwebkit4 2.2.1-4ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-24.37-generic 3.5.7.4
Uname: Linux 3.5.0-24-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Tue Mar 5 01:51:08 2013
InstallationDate: Installed on 2011-10-14 (507 days ago)
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: qtwebkit-source
UpgradeStatus: Upgraded to quantal on 2012-10-24 (131 days ago)
Raring has 2.3.0, does that fix this bug?