Apple Knowledge Base article 93061 points out that "A missing Shared (/Users/Shared/) folder may prevent you from making purchases from the iTunes Music Store. " This can also prevent purchased music playing as well. This might, as you could imagine, be somewhat difficult to track down and annoying to deal with.
Comments (0)
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030516144422746