I've dug a hole and need to learn how to climb out.
For a reason I cannot find the preamble for every document class reverts
to that for a KOMA-Script letter2 document. Looking in ~/.lyx I don't see
why this happens.
I exported the book I'm writing as a .txt file; it has no preamble
information, only the body text. Then I created a new document and the
default class is the letter. Changing the class to Book (standard) or
KOMA-Script book did not change the preamble.
While the empty document displayed I deleted everything in the preamble
after \date{}. When I inserted the text file and looked at the settings, the
class is still Book (Standard with extra fonts), but now the preamble has
all the letter directives.
My web searches do not find the answer; references to the lyx wiki that
I've seen do not tell me how to reset the preamble when the document class
is changed. I need a clue on where this is controlled so I can fix the
current situation and avoid it in the future. And, as an aside, with all
these attempts the Check TeX remains visible in the Tools menu.
Rich
