I suspect this is not the same issue but it maybe worth a try:
http://blog.craigbailey.net/2008/03/tip-fixing-ie-so-it-doesn-go-mental.html>Hi everybody,
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>I noticed this behavior couple of times already. I have several instances of FireFox as well as IE7 as well as other applications opened. In one of the current instance of IE I want to add a new tab (say, send something to gmail) and then IE7 silently goes down for all sessions...
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>Quite inconvenient, I would say.
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>Seems to coincide to my trying to look through MS Help articles (clicking of various links back and forth)...
>
>Oh, well...
>
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>BTW, the thread title should have been read as "Silent "downfall" of IE7" Got bitten with the same bug as Jay, though there were no error messages.