Commit 438536f6157794101ce0957e39cad6bf70580751 („Change underscores to hyphens in section labels“) broke the export of CUSTOM_IDs.
Take for instance this file: ----------------------- #+TITLE: Cosas por hacer * Programas :PROPERTIES: :CUSTOM_ID: programas :END: ** emacs :PROPERTIES: :CUSTOM_ID: emacs :END: Editor de textos ------------------------ When exporting (C-c C-e H) you get this table of contents: ------------------------ <div id="text-table-of-contents"> <ul> <li><a href="#programas">1 Programas </a> <ul> <li><a href="#sec-1_1">1.1 emacs </a></li> </ul> </li> </ul> </div> ------------------------- The first one is correct because it is first-level. All non-first-level get #sec-NUMBERS instead of the custom ID. Not only the table of contents; the header's ID is also wrong: <h3 id="sec-1_1"><a name="sec-1-1" id="sec-1-1"></a><span class="section-number-3">1.1</span> emacs </h3> Tested with current org-mode. Greetings, Daniel
