Do you use Xsan and Photoshop? If so, you may have seen this error message:
Could not save as "image.tif" because an unexpected end-of-file was encountered.To keep Xsan and Photoshop happy together, go to Photoshop's Preferences and choose File Handling. Under File Saving Options, select Image Previews and then choose Never Save.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050919161043242