ActiveX Control crash in IE's [file][new][window]

[Geo]

Hi everybody
I made a web application that use a ActiveX control.
It works well on IE. But if I click IE [file]->[new]->[window] to
open a new window, the IE will crash. I put a URL that using my OCX in
a e-mail or word document, if I click it , IE will crash too.
In my JavaScript

var obj = new ActiveXObject("testocx.InsertObj");<- create a new object for OCX
DTestocx1.AddObj(obj); <-- this line will cause crash

If I use other tab browser,like Maxthon, [new window] can be opened.

Does my control have problem ?

Thanks for any input!

Geo