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Originally Posted by DickBaldwin
I don't recall having written anything that bears directly on this issue.
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Guess that's why I didn't see it when I skimmed your tutorials.
One discussion somewhere mentioned the problem with loops not having been completed when another thread causes execuation of the thread with the loop to terminate early. That always seems to give some sort of "index error" and can be avoided if you always make sure any user input won't interrupt a loop before it completes.
Unfortunately, the above isn't a very good explaination because I really don't understand the problem - but it has occured several times when people try to use arrow keys to control walks, etc.