[SciPy-User] X Error: BadWindow, matplotlib, numpy

[Wolfgang Mader]

Hallo,

sometimes when I close a matplotlib window by clicking the [x] in the window 
decoration I get this in my ipython prompt

X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x6e00db6


I am using python 2.7.2, matplotlib 1.0.1-2, and numpy 1.6.1-1. What causes 
this?

By the way. Is there matplotlib for python3 or any plans for this?

Thank you,
Wolfgang