Not necessarily an Apple developer, but I ran across this when searching for an annoying bug I've been having lately on my macbook. Every few minutes, SecurityAgent.bundle steals focus from whatever app I have open. It automatically returns focus a few seconds later. The full path of the offending bundle in my case is /System/Library/Frameworks/Security.framework/Versions/A/MachServices/SecurityAgent.bundle Maybe this is related? I couldn't find any other info on this issue online.