instead of opening a new Internet Explorer window it is reusing current windows

I currently have multiply users that are using our program (all in the same office), that are having the issue of that when they go and launch a IE HTML page from our program it is launching into the current window that is open and not launching a new tab.

I was wondering if anyone has experienced this before?

Currently we are using:
to launch the web page.

The OS being ran is Win 7 with IE 9 and they say the "Reuse windows for launching shortcuts" is not checked.


I was just wondering if anyone had any ideas of why this or how to fix it.

Thanks for the help