I was using org-drill to learn Swedish verbs in the last couple of months. When I tried it again today I ran into problems. Whenever I answer 0, 1 or 2 when getting asked "How well did you do?" emacs opens the calendar and asks me to choose a date (just as if I typed C-! in an org file).
How to reproduce the error: 1. Open the attached file. 2. Do M-x org-drill RET. 3. Press any key 4. Press 0,1 or 2.
This problem might be related to http://article.gmane.org/gmane.emacs.orgmode/72138
I'm using GNU Emacs 188.8.131.52 with Org Mode 8.0.3 (according to http://orgmode.org/Changes.html this version includes org-drill 2.3.7).