Z-wave multi-channel issues

I have 1.1b-511 and several devices working on schedule just fine. However, I recently added a GE 28175 dual-outlet dimmer. I followed the instructions here to break down the one Z-wave device into two virtual devices:

The problem is that the virtual widgets don’t quite behave properly. Clicking the on/off/toggle icons do nothing, and I have to use the level slider to turn them on or off individually (and even then, changes don’t always “register”).

I know there is mention of a multilevel bug fix in build 514 (is that the same thing?), but has anyone seen behavior like this?