If you’re a Mac Pro user who’s updated to 10.7.4, you’ve probably noticed a bug present when you boot up your machine. Indeed, as MacGeneration reports, if you have a Mac Pro from 2009 or newer, you should see a ‘KeyApplicationTitle’ message appear, with ‘keyWarningOptimalInfo’.
Reported on the Apple Support forums, it appears that after some investigation it’s to do with the Memory Slot Utility application, located in /System/Library/CoreServices/. Until Apple release a fix, the easiest way to solve the problem is to simply move the application to another folder.
This doesn’t seem to be the result of any serious problem, just a false error message, so a quick bug fix from Apple should do the trick, even if it doesn’t affect any other Macs.