Device Options Not Available (N/A) in UI5

I was trying to configure a customer’s Fibaro Dimmer modules last night (set parameter 14 = 1) and noticed that his “Device Options” tab didn’t show any parameter info but just a blank screen with “N/A” in the top left corner…

This was the case with ALL of his devices, all of which were otherwise working fine.

I overcame the issue by setting the parameter through Luup code but would still like to know what was wrong…

Running UI5 1.5.622 on a Vera 3