This may be an issue of the Data Protector INternal Database not being upgraded. If your library has a barcode reader, and you have Barcode support enabled on your configured library, do a Barcode scan
This may also be a problem with Library configuration. In Properties for the library, click on the Repository tab. Does this all the slots in the library?
If you see the slots configured correctly in the Library, but, not showing up when you single-click on Slots, try scanning a unseen slot from the command line. Pick a slot number, and identify the name of a configured drive. From teh command line run
omnimm -repository_update "[drive_name]" -slot # Do not include teh [ ] marks
where "[drive_name]" is that of a configured device, and it should be surrounded by " marks, and # is the slot number
Finally, on the system controlling the robotics, at the command line, run
which should show in the "Exch" section, how many slots are seen on this library