On Feb 17, 2018, at 16:10, Dan Eble <d...@faithful.be> wrote:
> On Feb 17, 2018, at 15:13, David Kastrup <d...@gnu.org> wrote:
>> #(call-after-session
>> (lambda ()
>>  (hash-clear! default-fret-table)
>>  (hash-clear! chord-shape-table)))
> I see.  Thanks again.

That didn’t solve my problem.  LilyPond appears to process multiple scores in 
the same session.

I found that clearing the hash table in my engraver’s initialize() method did 
the trick.  In the end, I will probably copy the table in initialize() and 
restore the original in finalize().

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