This is an old thread, but I recently encountered this problem myself. 

If you look at the code in the TextItem example that comes with pyqtgraph, 
they call setPos() *after* plot.addItem(), so your code would change

FROM

    marker = pg.TextItem("W")
    marker.setPos(x, y)
    p1.addItem(marker)


TO

    marker = pg.TextItem("W")
    p1.addItem(marker)
    marker.setPos(x, y)

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