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If you are experiencing problems with a menu extra and can't seem to remove it by standard means, it may have a nonstandard implementation, which will take a couple of steps to root out and uninstall.
Tackling third-party launch agents and daemons may help odd system pauses after an OS update.
Following my recent outlining of a procedure for monitoring LaunchAgents, the Luxembourg CIRC created an easy-to-use setup utility that handles the procedure for you.
One problem that may occur when logging in to OS X is an error warning that mentions insecure startup items.
OS X supports a number of different ways to automatically launch applications and services, some of which are a little more obscure than others and may result in applications launching, even though they are not in obvious start-up items locations.
A few users who have installed Snow Leopard on their systems have run into a problem where upon logging in the system claims the "Startup Items" folder is insecure and items from this folder will not be used.
After the release of iWork '09 earlier this year, a Trojan was discovered circulating in pirated copies of Apple's productivity suite of applications (as well as pirated copies of Adobe's Photoshop CS4). Security professionals now believe that the botnet
Security Update 2006-003 (#4): StartupItems removal fix for startup issues confirmed; Removing the update; Other freezes; more
Security Update 2006-003 (#3): More on startup woes -- check the other StartupItems folder; Active Directory issues; more