Cannot save or activate controller bindings on custom controller.

[Sintry1]

I'm developing a custom driver for SteamVR and using a custom controller. While trying to create and save a new binding profile, the binding profile goes completely blank after I press save, and cannot be accessed again until I completely restart SteamVR. Then when I restart SteamVR and open the bindings UI, the binding profile is gone.

On the one occasion I managed to create one (which somehow was just the Vive controller defaults, but applied to my controller), I couldn't activate the profile and there was none associated with my controller. Pressing activate just did nothing at all. I don't know how to solve this issue at all, but it's infinitely reproducible. Screenshots are below.

The screen showing the available bindings:

The binding UI:

The save dialog just before pressing save:

The controller binding UI after pressing Save (stays like this until SteamVR is completely restarted):

The available bindings after restarting SteamVR: