Okay, so I've read up all the known issues of Facebook Connect buttons disappearing and noted the posts which were solved. I looked up the sites, including the JFBConnect demo using IE8 and did not see the button. It did however, work in FF and Chrome.
Lo and behold, when I checked the same sites using IE8 but on Vista on another computer, it worked. Is there something to Windows 7 or a default IE8 setting that I'm not checking which Windows 7 enables? Thanks.
For what its worth, the Facebook Connect Image was showing up fine on the same computer using IE 8 prior to my upgrade from Vista to Windows 7.