Do you log in with same ez user?
Do you use any kind of ip settings in ez?
Are you using any apache rules/settings/vhosts based on ip?
Does it help to disable the online editor? Are you using the same browser?
The can't fetch object shouldn't have any effect on this, you can enable ValidateEmbedObjects if your using ezoe (oe 5.0) to see these embed tags visually in the editor when you try to publish.