Aaarrgghhh.... I had typed half a page ranting about the horrible, despicable, piece of junk, worst garbage I ever bought, pathetic Digidesign MBox when Safari went down, so, you were spared most of that. In the interest of time (in case this safari install crashes again), see if you happened to have installed anything from Digidesign e.g. CoreAudio driver. I did install the latest driver for my MIDIMAN 4x4 USB interface. Get it from their web site and then see if that helps.
http://www.m-audio.com/index.php?do=support.drivers&k=driver&s=4&p=a4fc99df673e5 4ff97ce399bbbfdef71&o=MacOS+10.4.4+-+PowerPC%28G3-G4-G5%29&f=564
Still, I was constantly getting this error that the MIDI server could not be found in Audio MIDI set up but as soon as I UNinstalled everything from the Digidesign installer, everything in MIDI showed up beautifully. Avoid buying MBox, even if I am the one trying to sell an almost brand new unused much hated like-new one.
Imran
Audio MIDI Setup was unable to launch the MIDI Server. This means that you will be unable to view or edit your MIDI configurations.
Improperly written MIDI drivers can prevent the MIDI Server from launching successfully. If you have recently installed a new MIDI driver, try uninstalling it and then relaunching Audio MIDI Setup. If Audio MIDI Setup works correctly after that, then please contact the driver's manufacturer for further support.