It still takes a long time before the problem first appears, but once it starts, it pretty much keeps on going. For some sites the problem will appear on a window, but hitting Return in the location bar will cause the page to be displayed correctly (with the bogus window disappearing). For this site, once the problem appears, any kind of navigation (forward to new threads, back to previous pages, etc) has the problem.
Thanks for the recap.
One site that seems to suffer from the problem pretty consistently is the discussion threads at http:// www.realworldte ch.com/ forums/ index.cfm
It still takes a long time before the problem first appears, but once it starts, it pretty much keeps on going. For some sites the problem will appear on a window, but hitting Return in the location bar will cause the page to be displayed correctly (with the bogus window disappearing). For this site, once the problem appears, any kind of navigation (forward to new threads, back to previous pages, etc) has the problem.