QT update doesn't fix the problem Posted by mholmes on 07 May 2010 in Activity log, Half-Baked Contributions Did a QT update, but the issue still remains: "source_parent was not valid", in either filterAcceptsRow or filterAcceptsColumn of HcmcIdFilter. I'll probably need to re-read all the documentation on QSortFilterProxyModel... This entry was posted by Martin and filed under Activity log, Half-Baked Contributions.