QFileSystemwatcher not working when file added to directory

hi friends,
i was using QFileSystemWatcher and used

Code:

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connect(theFileWatcher,SIGNAL(fileChanged(QString)),this,SLOT(updateGallery()),Qt::QueuedConnection);
        connect(theFileWatcher,SIGNAL(directoryChanged(QString)),this,SLOT(updateGallery()),Qt::QueuedConnection);

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now the updateGallery() is been called only if i remove any file from the directory and not when i added any files to the directory ..

this was working earlier fine but it happened suddenly. did anyone faced this problem before ..?
im running itin windows 7

please help me ..