I have already determined that the McAfee SiteAdvisor plugin does not cause the issue. I have no other toolbars I can uninstall. The only remaining extensions are Shockwave Flash, the Java console, etc. -- things that I am sure everyone else has.

I can only conclude CodeGuru is the cause of the problem. But, it doesn't occur on every machine, as others have stated (do you guys have ad-blocking software installed?).

It would be great to find out how many other people are or are not experiencing this issue...