Axel Bittkau - 2010-07-20

The issue is found. You have to change the Q_PROPERTY statement in the appenderskeleton.h file from:
Q_PROPERTY(Level threshold READ threshold WRITE setThreshold)
to
Q_PROPERTY(Log4Qt::Level threshold READ threshold WRITE setThreshold).

Backgroundinfo: The Level is registered in the meta-object stuff of Qt with the fully qualified name Log4Qt::Level but with Q_PROPERTY only "Level" is specified.