Same kind of issue. I am using a Linear PD300Z-2 dimmer for testing purposes. Couple of weeks ago it was working OK (I think) with a simple dimmer Item in the items file and a slider statement in the sitemap. Slider was running ok increasing and decreasing voltage of the connected lamp. Now this thing does not work anymore. I do not know what has been changed in my system but now the slider widget does not show up anymore i just see the arrows widget in the sitemap. Even if I click on them…no effect. Yesterday I did reload Openhab(1) runtime and the zwave binding and still the same problem. If anyone has an idea of what is going on, I would appreciate. I am running OH1 on a macbook pro with latest OSX, the zwave stick is Homeseer.