ActiveX Problem with IE...

I wrote and published an ActiveX on a Web Page. It works OK but when I try
to go to another Web Page, Internet Explorer (my version is 5.5) raises an
exception and exits. What's the matter?

If you want to try:
http://www.amps-llc.com/ecg/ecg

(because of a temporary bug, better if no other windows than Internet
Explorer are open!)

Thanks in advance, Umberto