I've just upgraded to 0.7.2 (Python 2.4 on windows) and I'm seeing strange behaviour with the scatter plot markers. If I run the scatter_demo.py and change the marker to use any of the triangles:
'^' : triangle up
'>' : triangle right
'v' : triangle down
'<' : triangle left
the resulting tkagg or png output has the triangles pointing in odd directions (sometimes even at 45 degrees).