In your more recent versions (9-4-2017 & 8-17-2017 & maybe others) there is an issue when using “is changed” for multi-select checkbox type fields. The rule is only fired on the first change or first checked box. It should be firing and used to fire each time a checkbox is checked. I am attempting to call a custom js function each time the field is changed to make sure the user isn’t checking “None” in addition to other values. If I call the function manually in the console it works as expected but is not being fired on the change of any checks subsequent to the first check.
Just updating to let others in on what we found. I have fixed it in the version currently in the BETA folder in the download section. This version should be OK for prod, but I have one small thing to sort out before I can post an official new version.