Why would a UV BASIC (compile) command hang?

Question

An empty item is created in the .O file, but the BASIC command never returns to the > prompt.

There is 5-month-old object, so the BASIC command has worked in the past.

Windows Server 2016 Datacenter running on a VM

    RELLEVEL
001 X
002 11.2.5
003 PICK
004 PICK.FORMAT
005 11.2.5

Answer 1

The source code was missing a final newline. Notepad++. Sigh.