objects missing from object docker.

I updated to the latest version a couple of week back.

Some of the older files being opened in the newer version of coreldraw does not list all the objects in the object docker. I can see the object on the display but is not listed in the object docker. 

It is very easy to show this as when the object is selected on the display the corresponding object is highlighted in the object docker.

Does anyone know if this is a bug or something that has been fixed?

cheers PeteM.