Option A: you don't have sufficient privilleges to see the Objects
Option B: the CatalogFile is not available, accessible or corrupted
Check if your IDB is consistent (omnidbcheck -extended) if you have BF or DC Errors that might be the cause.
If you import the Catalog make sure to use the force option to update the IDB Data.
If it still doesn't work, export the Media, purge the remaining Data from IDB (omnidbutil -purge -daily, omnidbutil -purge -dcbf -force) and do a complete import again.