[Brian]

Sorry for the confusion here, Pixelfairy - when OmniGraffle links to an image, the links are absolute. They specify the entire path to the linked files on your computer; that's why your client can't see them. The path to those files is different on his Mac than it is on yours.

Our suggestion would be to use File -> Export to place a new copy of the OmniGraffle document in the shared location instead. (Set the "Format" pop-up to "OmniGraffle Document", then pick your DB folder as the location to export the file to.)

That will create a new version of your file with the images included. Your client can use that, while still allowing you to use the linked version while working on your Mac.