matplotlib 0.98.0 error messages when releasing the mouse button

Hi,

I got the following messages after clicking with mouse in my
application:

Traceback (most recent call last):
  File
"/usr/lib/python2.4/site-packages/matplotlib-0.98.0-py2.4-linux-i686.egg/matplotlib/backends/backend_gtk.py",
line 201, in button_release_event FigureCanvasBase.button_release_event
(self, x, y, event.button) File
"/usr/lib/python2.4/site-packages/matplotlib-0.98.0-py2.4-linux-i686.egg/matplotlib/backend_bases.py",
line 926, in button_release_event self.callbacks.process(s, event) File
"/usr/lib/python2.4/site-packages/matplotlib-0.98.0-py2.4-linux-i686.egg/matplotlib/cbook.py",
line 152, in process func(*args, **kwargs) File
"/usr/lib/python2.4/site-packages/matplotlib-0.98.0-py2.4-linux-i686.egg/matplotlib/backend_bases.py",
line 1496, in release_pan for a, ind in self._xypress: TypeError:
iteration over non-sequence

Mátyás János