diff --git a/src/mouseTrap/ocvfw.py b/src/mouseTrap/ocvfw.py

--- a/src/mouseTrap/ocvfw.py

+++ b/src/mouseTrap/ocvfw.py

@@ -185,13 +185,18 @@

         """

         # calculate the optical flow

-        self.imgLKPoints["current"], status = cv.cvCalcOpticalFlowPyrLK (

+        optical_flow = cv.cvCalcOpticalFlowPyrLK (

             self.prevGrey, self.grey, self.prevPyramid, self.pyramid,

             self.imgLKPoints["last"], len( self.imgLKPoints["last"] ),

             cv.cvSize (20, 20), 3, len( self.imgLKPoints["last"] ), None,

             cv.cvTermCriteria (cv.CV_TERMCRIT_ITER|cv.CV_TERMCRIT_EPS,

                                20, 0.03), 0)

+        if isinstance(optical_flow[0], tuple):

+            self.imgLKPoints["current"], status = optical_flow[0]

+        else:

+            self.imgLKPoints["current"], status = optical_flow

+

         # initializations

         counter = 0

         new_points = []

@@ -202,14 +207,13 @@

             if not status or not status[counter]:

                 # we will disable this point

                 continue

-            

             # this point is a correct point

             new_points.append( point )

             setattr(self, self.imgLKPoints["labels"][counter], cv.cvPoint(int(point.x), int(point.y)))

             # draw the current point

-            cv.cvCircle (self.img, [point.x, point.y], 3, cv.cvScalar (0, 255, 0, 0), -1, 8, 0)

+            cv.cvCircle (self.img, (int(point.x), int(point.y)), 3, cv.cvScalar (0, 255, 0, 0), -1, 8, 0)

             # increment the counter

             counter += 1