The issue is basically related only to .gho image files, they show as 0KB file size on the package server tab of the agent and also it takes a long time to try to process the files on the package server. However, the time that these files take are expected as they are large files and need to be compared to the file on the server.
This issue has no effect on the .gho package being accessed by tasks and the packages are downloaded with the correct size to the package delivery folder.
This issue is currently being worked on by the development team and a fix will be included in a future release.
ITMS 7.5 SP1 & later