When you have an even number of comment with the same id (ie comment #1 or comment #1.2, etc) the drop down becomes innaccessible.

The issue comes from the template comment-script of comments.xsl that do the following query to add the click listener : $j('[data-ametys-comment-id="%%id%%"][data-ametys-is-comment]');

This query is not retricted to the comment wrapper and therefore the listener is added on all comment with this id. With an even number of comment with the same id, we toggle the active class an even number of time resulting in no toggling at all.