zoom widget shows and apply a wrong value

[giacomo]

you can watch it in the 3d view:
_ play the scene "aura-zoom_24" (zoom 24 degrees)
_ select all the fixtures (ctrl-a or click on the selection button)
_ open the zoom widget >> all the beams are changed to around 45 degrees.

if you watch it in the dmx view: the zoom channels are @185 when you play the scene but after opening the zoom widget they change to @71
resetting the dumped channels restores the output again to the correct @185.