get started
concepts
features
syntax
intro
mods
REST API
github
blueprints
tickets
support
ideas
contact
license
Go to the rules on a card. Open a group and setting to edit and click cancel.
The specifics where I saw the issue was a structure setting on a type set (Book+*type+*structure), when accessed from a particular book card.
a fix for this is in master and will be out with the next release.