On Tue, 26 Jan 2016, Rich Shepard wrote:
In the former KOMA-article class,
Liviu pointed me to the solution: one cannot convert an existing document to the Elsevier article class. Instead, it's necessary to use File -> New from template and select the Elsevier article template. Cut-and-paste from the original document and it complies just fine. The appearance is extremely different so there must be hidden foo in the template that are critical to the document's compilation. Thanks, Liviu! Rich