From the article
update Apple Computer released an update Thursday to its latest patch, a move designed to address installation problems with a fix released earlier in the week.
After installing Apple’s original Security Update 2006-002, people may find that Safari has a blank icon that won’t launch the Web browser, the Mac maker said in an article on its support Web site. The problem occurs if the user moved Safari out of the applications folder before installing the update, the company said in the article.