Knowledge document embedded images stopped appearing after upgrading CA Service Desk to a newer version.
Service Desk 17.1
Service Desk 17.0
Service Desk 14.1
It happens if the "Upload Path" in the "Knowledge Attachments" repository is misconfigured. If you have a high availability environment with a shared folder for images, you have to pay attention if the "Upload Path" is properly configured after an upgrading process.