I have been plagued by KeypadLinc buttons not remaining in sync with devices they are linked to through scenes. I have tried replacing devices with no luck.

 

Recently I added both the device and the button as Controllers for a scene with no responders. This seems to have fixed the problem in more than one location.

 

Any idea why I am having the problem and why it would be resolved this way?

So you are saying that the buttons are still part of the other scenes, you just created a new scene that is the same as the other scene but with all buttons and switches as contollers, no responders?

No new scene. The old ones weren't working when I had the button as a controller and the device as a responder. I removed both from the scene and re-added them both as controllers and now they are in sync.

 

I don't remember having to do this in the past.

Multiple controllers must be defined as controllers of the scene. Defining one as a Controller and the other as a Responder insures the devices will get out of sync. The ISY will automatically generate all the cross-links necessary to keep the devices in sync when the controllers are defined as controllers. No need to add them as responders. ISY does this automatically.