I don’t see any reference to this in the known bugs, so if I missed it let me know. It appears there is a bad problem on my installation of Beta 1.3. I had a file with two external references. After splitting the file, I dragged one of the external references into the new file in the Binder. That external reference just completely disappeared! It is gone from the old file, and it’s not in the new file or anywhere else I look.
Thought you’d want to get this one on your list.