I had exactly the same problem with our new MSL4048 tape library with FC tapedrives. BE10d could only see the tapedrives as standalone drives. I also tried to install the HP MSL G3 driver, but nothing helped.
4 days ago I tried to make a completely new installation of BE10d on a new server, and the MSL G3 robotic library with two tapedrives suddenly appeared in the BE10d device list.
I used http://support.veritas.com/docs/280710 to copy the configuration of jobs and media sets from the old server to the new server, and yesterday I had the new backup server up and running.
I hope you can use my advice.