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Now that ActiveState has released a version of Tcl/Tk 8.5 (8.5.9.2) for Mac OS X that is also an Aqua Cocoa Tk (like the Apple-supplied Tk 8.5.7 in 10.6), versions of Python linked with the new ActiveTcl 8.5.9 do not display the kind of problem reported here as well as a number of other problems reported elsewhere. For 2.6 (which is now in security-fix-only mode since the release of Python 2.7), you might need to modify Python's setup.py to link properly with the ActiveState 8.5.9 or with Tcl/Tk 8.4.
There is now a webpage that summarizes the somewhat confusing state of affairs with regard to Tcl/Tk support with Python on Mac OS X:
 http://www.python.org/download/mac/tcltk/