[Denemo-devel] restore default "score layout" ?

[Bric]

while (unsuccessfully) searching for the "non-printing" toggle for a 
staff, i created a custom layout, then deleted parts of it, and, i think 
the consequence was that I destroyed the lilypond code — although i'm 
not certain that was the cause-and-effect.

The typeset music window now has "INVALID lilypond could not typeset 
this score"

So, how do I get back to the "default layout" ?

I tried to debug by exporting my score to lilypond, and compiling the 
lilypond with just lilypond, but, amazingly, the *.ly file, at a glance, 
looks OK, but it won't compile into a PDF, and does *NOT* throw and 
error at compile time (!!)  Just silently fails to generate the PDF, but 
reports "success" at the command line (!?!) never had this happen 
(normally, lilypond reports an error when it can't compile)

I see my custom layout mentioned inside the lilypond file, at a comment 
line. But I can't tell if it's really the element that causes the problem.

thanks again