I have Tcl/tk 8.4.7 installed.

To reproduce the hang on my machine:
open IDLE
new window
enter the following code:
  for i in range(10)
      print(i)
run module (saved as test.py)
interpreter complains (shell is still responsive at this point)
fix the code by adding the colon after the for loop
run module again (at this point, IDLE hangs)
While the top menu bar is responsive, all options are greyed out, and
apple-Q doesn't work. Force-quit is necessary to shut IDLE down. Also,
the force-quit menu doesn't show IDLE as being unresponsive, whereas
usually there will be a red alert for an unresponsive program.

Hope this helps