This is meant to be informative, not as a rant, and I do not mean to invite any rants by posting this (ranting won't change anything, anyway. Apple does not monitor these forums). Last year, after a Security Update (beginning with, I believe, 2008-007) many Tiger users when trying to enter Network Preferences reported getting an endlessly looping pop up saying, "Network Preferences have been changed by another Application."
This was the first, but it is only one of many related threads. Seventeen pages long and counting.
http://discussions.apple.com/message.jspa?messageID=8098920
I'm ready to be corrected, but it seemed to be happening only to those who installed the Tiger update. There were a number of ad hoc workarounds and fixes developed by users, but Apple, in subsequent security updates, never, to my knowledge, resolved the problem or developed a patch. It was a completely head in the sand response. Apple and Apple tech reps were certainly aware of the issue, since they were, themselves, suggesting one of the (lamer, non-permanent) workarounds by telephone. It was reported directly to Apple as a bug by a number of people.
To this day there are still people on the forums here--presumably those who only just discover it when they try to enter Network Preferences for the first time since those updates--reporting the looping pop up. My feeling then was that Apple's writing updates for Tiger--as a soon to be orphaned OS version--was becoming slipshod or, that Tiger users weren't getting a fully Tiger dedicated update. I could be wrong, but I don't think anyone using Leo reported this issue. As the Security Updates are usually cumulative, I wouldn't be surprised if this bug is still present in the latest one.
This seemingly Tiger only issue in Safari 4.0.3 bears a striking resemblance to the presumably Tiger only issue I just described.
I would be more than happy if Apple corrects this in a subsequent update for its poor cousins still using Tiger, but I wouldn't hold my breath.