Martin,
You wrote:
But if you close the Transcript window, or if you remove a certain "Transcript show: '' . " statement in the FiveInARowGame>>performAI method, then mouse response will become less responsive in the game, and the 'Crosses'' turn.' tag will not update as it should any longer.
I tried your game in Squeak 4.1 (I know I am a little out of date. I don't know which Squeak you used.)
I did not notice any change in responsiveness whenever I tried any of your transcript related changes.
the tag 'Crosses'' turn.' will change to 'Nought''s turn.' and back again
I never noticed this happen. ( Perhaps me machine is too fast, or eyes too slow :D) but the turn notifier switching works fine when I step through it with the debugger, with the transcript window closed.
Hope this helps,
David