Hi, Org Mode contributors. I was able to figure out the issue: my versions of the packages `org' and `org-plus-contrib' were not matching. Updating both solved the issue.
Sorry to bother, thanks for the attention and---again---thanks for Org Mode. It rocks! Best. -- Leandro Facchinetti <m...@leafac.com> https://www.leafac.com GPG key: 3DF3D583