Persistent Editor Segmentation Fault

Hello Dear Gurus,

Can you please help me with the following problem. Our company has just switched the Qt from 4.2.2 to 4.4.3 which brought an mysterious problem related to persistent editors.
There is a QTableView derived class which holds a single persistent editor (QPushButton). There is a slot for QPushButton::clicked signal. Inside that slot our code modifies the model and then calls QAbstractItemModel::reset which makes Qt print "QObject: do not delete 'MyBtnName' during its event handler" by crashing the app.
Note that this behavior wasn't in Qt4.2.2.

Is anybody familiar with such a situation?

Thanks in advance!
Arman