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A) Do you have a reference for this (not that I don't believe you, just interested)?
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Here's something that someone recently posted at FCP which gives us a clue on elements used in pokerstars' shuffling methods.
linky (edit: forget this link, AngusThermopyle's link is better)
To the OP:
In what way were you not able to chat? Are you unable to click on the textbox and see the blinking cursor or you manage to see the cursor and type the words, but after you hit enter, it does not show up in the chat box?
Does re-enabling mouse tracking in zonealarm immediately remedy this issue?