Michel,

FWIW both my recent IE5.5 installs on a NT4 and W98 boxes are not exhibiting the Username not found errors when new window browser windows are closed.

>Recently, I've been informed that the problem in IE where the cookie is not broadcasted to a new window might be fixed by applying a setting in IE. There seems to be a setting which controls the environment to be seen by a new window. If that setting is OFF, that might have explained why we obtained that behavior.
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>However, we were unable to find where to go in the setup to adjust that. If anyone knows about it, please, let me know.
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>Again, this bug appears occasionnaly for some people and all the time for other people. It is also current to various versions of IE.