... can anyone explain this "phenomenon"?

Frequently, after logging-on ... and particularly when I'm switching between the sub-headings 'Members List' and 'Today's Posts' ... I'm confronted with the following pop-up message:

"Internet Explorer cannot open the Internet Site
http://filipino forum .........

operation aborted"

And it means going back to Square 1, so to speak. Damned infuriating!!