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I found the problem! :D
Around line 394 of PyShell.py roughly, this function:
 def start_subprocess(self):
 # spawning first avoids passing a listening socket
to the subprocess
 self.spawn_subprocess()
 #time.sleep(20) # test to simulate GUI not accepting
connection
 addr = (LOCALHOST, self.port)
 # Idle starts listening for connection on localhost
 for i in range(3):
 time.sleep(i)
 try:
 self.rpcclt = MyRPCClient(addr)
 break
 except socket.error, err:
 pass
 else:
 self.display_port_binding_error()
 return None
 # Accept the connection from the Python execution server
 self.rpcclt.listening_sock.settimeout(10)
 try:
 self.rpcclt.accept()
 except socket.timeout, err:
 self.display_no_subprocess_error()
 return None
 self.rpcclt.register("stdin", self.tkconsole)
 self.rpcclt.register("stdout", self.tkconsole.stdout)
 self.rpcclt.register("stderr", self.tkconsole.stderr)
 self.rpcclt.register("flist", self.tkconsole.flist)
 self.rpcclt.register("linecache", linecache)
 self.rpcclt.register("interp", self)
 self.transfer_path()
 self.poll_subprocess()
 return self.rpcclt
It spawns the subprocess, but never manages to talk to it.
The socket.timeout exception is raised. Communication to the
subprocess fails in here:
 try:
 self.rpcclt = MyRPCClient(addr)
 break
 except socket.error, err:
 pass
Then, it tries to register the functions with tkconsole, and
TkInter seems to die. I haven't dug down into it yet to see
what exactly happens. But, I suspect that rpcclt is null
when self.rpcclt.register() is called.
So, it's not a Tk error. It's an error with trying to
contact the subprocess.