Beto, deu certo!! Ajudou e muito!! Obrigada!
Testei tb as outras indicações e o máximo que obtive foi descobrir que o header já tinha sido enviado, aí comentei uma parte do código, e ele não abriu a janela do PDF, me retornou um monte de caracteres malucos...
Assim:
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Talvez isso ajude, colocando no htaccess da sua aplicação.
php_value display_errors 0
espero ter ajudado