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It *is* intermittent.  Try entering the tutorial examples (copy 
and paste) and pressing Ctrl-C at random.  That works for me.

Here's another example: today I rebooted, then later clicked 
on the "Python (command-line)" shortcut.  I typed 1 and 
pressed ENTER.  I then pressed Ctrl-C.

Boom.  Window disappears.

I tried again around 20 times -- it gave a KeyboardInterrupt 
each time, as it should.