I thought so, but I went back to reproduce the problem. The first time the error message comes up is when I try to set the dimmer level for a button push:
As soon as I click away from the above highlighted dim level field I get the error message. Then I get the error message on any attempt to click the Select Actions button after that.
Chrome on Windows, Debian, and on my Android phone. ...same issue on all 3 devices. It happens whether I enter a number or not, as soon as I click out of the field.
I'm getting the same error when trying to add "adjust level" to a button push event using an up to date Chrome browser and Firefox browser in fully updated Windows 10. It first happens when hitting done after making the selections, then happens as soon as I hit the "push" in the app to edit it. No rule shows up in the "push" box btw.
@bravenel The same thing is still happening to me. It is only when I try to enter a value for "adjust level". I didn't bring it up anymore because it seemed to work once and I figured that it was just me. This happens in Firefox, Chrome, chromium (my Debian daily driver), and android chrome browsers. I made a crude video cap of the problem.
Here is a link to my video capture of the issue:
You can skip ahead to 1:43 to see the problem in action. Also, you may want to set the video to 720p so that it is more clear.
Button Controller 3.0 doesn't give me any issues, but 3.1 does.