Flyouts no longer work on www.msnbc.msn.com

Can anyone tell me why suddenly "flyouts" on http://www.msnbc.msn.com /
no longer work on my computer?  I assume it has something to do with
my firewall (Symantec Client Firewall).  When I disable the firewall
and clear Windows Internet Explorer cache, flyouts work - for a
while.  But eventually they stop working again.  For the life of me I
can't see how Symantec is blocking this.  Videos no longer work from
msnbc either.  Assume this is all related.

I'm running WinXP and Explorer 7.

Thanks,
craig