Symptom
An item in the Dock does not work, or it appears as a question mark (?), instead of as its normal icon.
Solution
When adding items for the Dock, the full pathname of the item is written. If the administration computer at which you are using Workgroup Manager has that item in a different path than at the client computers, the Dock item may not work. Administration computers should have software or other target files installed in the same location as on managed client computers.