I don't know how often SiteAdvisor updates, all I know is it does it silently (in the background without any warning). I meant did you try unchecking Highlight Results to see if that made a difference. I've moved this to its own topic as it is slightly different to that of the previous thread.
In any case I will pass this on.
You might want to use their feedback form too, linked in my signature. Don't pick the General Product Support Option though as that leads you elsewhere.
There is no product update page so nobody can tell what changes have been introduced from one edition to the next.
There is their blog which may give some clues: http://blog.siteadvisor.com/
Sorry, forgot about that.