2012 Subassembly do not connect to the new Assembly I am creating

[rplese]

Background:

In this drawing this use to work.  In a new drawing this works but, I don't want to start all over.

Here is what is happening:

  1) I create a new assembly. (Three others reside in this drawing.)

  2) From the tool palette I select a subassembly to add (I have tried many of them)

  3) I select the assembly I just created.

     Results: ... Nothing... Subassembly does not appear.

  4) I select again

     Results: ... Nothing...

  5) I right click.

  6) I select again

     Results: ... Nothing...

  😎 I insert the subassembly to an open area

     Results: Subassembly is inserted.

  9) I select and try to move the subassembly to the assembly.

     Results:  Subassembly does not attached to the assembly.

 10) I check the assembly properties.

     Results: No subassembly is listed as being attached to the assembly.

Has a setting been changed? If so which one?