Do you have a multiuser setup or single user setup? you would need to check if the contents from system/publishing/styles/user productivity kit are in place. If you are working in a multiuser setup, you can check the permissions for the authors on system folder. if the problem is with just one developer/developer client, then you can take export of the styles/user productivity kit from working station and import it on the one where you have problem.
We're in a multi-user environment. All developers have the same symptoms. The Contents were missing ever since the ServicePack installed 'itself' (we have yet to find out what happened there - one would think it would take a System Admin to perform the update)
After putting a SR in with Oracle, they recommended that we re-install, so we upgraded to 12.1.
thanks for your response Sumeet Darode!