Remember to cover the basics, that is, what you expected to happen and what in fact did happen. You don't know how to make a good report? See https://orgmode.org/manual/Feedback.html#Feedback Your bug report will be posted to the Org mailing list. ------------------------------------------------------------------------ If your org-clock-history has 44 or more elements, then the "c" character will no longer go to the current task, but to the 44th clocked in task. Similarly for [d]efault and [i]nterrupted. The function first adds (?c . marker-to-current-task) to the sel-list, then goes through org-history and uses 0-9 and A-Z and then keeps going through lower case letters without caring about whether the letter was already in there. Emacs : GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0) of 2020-08-27 Package: Org mode version 9.3 (release_9.3 @ /home/unhammer/PREFIX/emacs/share/emacs/28.0.50/lisp/org/)