Ludger reported a Qt Problem that the MPLWidget was not recognized as an PySide.QtGui.QWidget; the problem was not reproducible on my system; maybe the problem was caused because getnoisewin is now imported from pick/utils and there matplotlib is imported for plotting reasons but to clarify the Qt backend used by matplotlib, it should not be imported before

QtPyLoT.py

@@ -24,6 +24,10 @@ https://www.iconfinder.com/iconsets/flavour
 """
 
 import sys
+import matplotlib
+
+matplotlib.use('Qt4Agg')
+matplotlib.rcParams['backend.qt4'] = 'PySide'
 
 from PySide.QtCore import QCoreApplication, QSettings, Signal, QFile, \
     QFileInfo, Qt