Well, CSSU stable is really rock stable and is very easy to be installed. We(developers) just cannot keep all the Qt software backward compatible with Qt 4.7.0 in PR 1.3 (and its bugs) forever for the sake of nothing. Instead of keeping qmltube compatible with unmaintained and buggy Qt version, isn't it better to just warn your users that they should install CSSU? Or do a runtime check for QT version and disable unsupported functionality? Only a proposal, of course. BTW great work man, qmltube is the software I admire most of all the things in repos (even if I use it rarely)