I confirm the observation made by keithianw 4/29/2009 that simply going to "advanced search" results in all Site Advisor icons and information appearing properly, along with the details onmouseover. Site Advisor continues to work even after returning from the "advanced" menu and doing normal searches. It definitely seems like something associated with the google site implementation. (Using: WinXP with all current updates, Firefox 3.0.10, Site Advisor 2.9, www.google.com).
I just noticed another behavior with Google that may correlate with the SiteAdvisor problem. When you used to type in a search word in 'simple search' and then selected one of Google's pull down suggestions, browsed your results and then went back to the search screen, it used to 'clear out' your original typed search words from the box. Now that doesn't happen anymore. You have to clear the word or words manually. Now this is also the behavior in the 'advanced screen' now too, but something was changed in both pages recently by Google that may correlate. Coincidence?
Edit: I just tried this on a computer with IE7 and found that word searches are 'cleared' from the search pane when you go back to the simple search page in Google. However, this doesn't happen in Firefox anymore. It USED to, but not now. Both browsers don't clear anything in the 'advanced search' page when you return there, so IE7 and Firefox are both working the same there. Part of the bug? Is it an Active X verses Java Script bug?
Only adding my name to "the list". Generally, when I wait a day or so, the problem "right's itself". Not this time. (It's been 3 days) Using the most recent free standalone version. It works with IE7, not with FF v3.0.10. It does work when accessing www.l.google.com, but notwww.google.com. Since I use Google as my search engine, and FF as my browser, it makes me a very unhappy camper. sad
Thanks to Jordan_L for suggesting the workaround.
Patiently awaiting a fix.. wherever it may come from...
I suggest you all contact Tech Support Chat as none of us on the conference call could repro this. If you have any other protection turned on other than McAfee it could be affecting things, but it's doubtful. We all think it's a Google issue.