In our application we have a link that opens a new window displaying the
contents of a page that can be customized by our end users.  When we call
window.open() we save the resulting window reference so that if users
navigate away from our application we can close the window.

One of our customers has created a page using MS Word.  I believe they are
saving it as a "Web Page", not a "Single File Web Page".  When they click on
the link to open the window to display this page the page loads fine.  The
problem is that when they close the window, the original window that opened
the pop up is frozen (i.e. it stops responding).

Something else that is really strange is that if we skip storing the window
reference returned by window.open(), the problem does not occur.

This only occurs on certain versions of IE 6.  I am able to reproduce the
problem on IE 6.0.2800.1106 running on Win2K Pro.

This doesn't occur if the page that is opened just contains standard HTML.
I can't even reproduce it when I create my own test page using Word.

Has anyone else experienced anything like this before?