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I appreciate that many others see this is a problem in 
embedding Tcl, but without any clear way to reproduce this in 
Tcl/Tk itself, it's very hard for me to fix it.  I don't think that 
there is anything done in 8.4 to fix this that I recall, but if 
someone finds that the problem "goes away" with 8.4, please 
report that.

For those of course that experience this with python, the 
simple and "correct" work-around is to launch with 
pythonw.exe instead of python.exe.