If you import an image to DS 7.5 using the Resource Import tool, these images will create packages in the console and be copied to the proper folder locations, but never replicate out to site servers. The GUID folders are created on the site servers, but the images don't copy over.
This is being worked on at this time.
The current work-around is to manually copy the images into the appropriate GUID folders on the site servers. They will work just fine when it comes to imaging.