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According to some of the comments below this still works with Mountain Lion and the new Mavericks! I have since purchased a family pack of iStat Menus 4.x so I cannot verify this myself.
I have recently upgraded to Apple’s OS X Lion and like a lot of other people I am updating the “Nooks and Crannies” of my software portfolio to work with Lion. I wasn’t affected by Apple removing Rosetta from Lion (with the exception of the NoMachine client), but there were a couple of pieces of software that required upgrades. iStat Menus was one such piece of software, but not in a traditional way. I run version 2.x of the software because it meets my requirements and it is free, whereas version 3.x costs $16 US at the time of this writing.
As long as you install iStat Menus under Snow Leopard and upgrade OS X to Lion it appears to work correctly. If you make a change to what you are monitoring, however, you will no longer be able to change it back. So for example if I turned off disk monitoring and went to turn it back on I get:
Could not load extra iStat menus could not load the disk activity extra
To investigate this problem open up the Console.app using Applications –> Utilities to see any error messages. I have error messages in the system.log that look like the following:
Sep 12 06:38:41 <removed> SystemUIServer: MenuCracker: Failed to swizzle -[SUISStartupObject createMenuExtra:atPosition:write:data:], can't load. Sep 12 06:38:41 <removed> SystemUIServer: failed to instantiate and get the principal class of bundle: NSBundle </Library/Application Support/iStat local/extras/MenuCracker.menu> (loaded)
Googling for “MenuCracker.menu iStat 2” I ran across Long Nguyen Hai’s blog. On his blog he mentions that you can overwrite the .menu file with an updated version from SourceForge. Lets try it out.
sudo killall SystemUIServer sudo cp -rp /Volumes/MenuCracker\ 2.2/MenuCracker.menu /Library/Application\ Support/iStat\ local/extras/ sudo killall SystemUIServer