NetVault only shows a handful of slots, but lots of ports in device management. When using a Quantum PX502 library, moves and unloads failed with "Lost move destination from internal tree" et al.
Reconfigure the library - remove any partitions you might have configured (Web interface -> Setup -> Partitions) so that the library will reconfigure the default partition during the next reboot. On Setup -> Library, also make sure that the "Load Ports" for "Cabinet 1" are set to "None" for Left and Right, instead of "Column" or "Magazine".
Then remove the library in NetVault and reboot it. Once online again, NetVault should see 38 slots for the library and no ports at all.
