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I have the same problem - I'm desperate for the answer. Something about an exisitng drawing with existing parts that can't be added to? I'm stumped. I'm wondering if this is a real issue or not and if so, is it fixed in C3D12 or 13.
I now see that post I responded to is ridiculously old...still having this problem?
The way I get around it is create a new network, use the new catalog, and then merge networks. Should just work...add a part...and it should show up in available parts.