Radio volume not working

[Rolds]

The radio volume knob isn't doing anything, also doesn't appear to be animated correctly, it turns in the "up" direction, but not down and for all I know that may be related.

[Opalias]

The hot keys work for me, but not the clickable button, though I do get the cursor change when I mouse over it.

[dorianR666]

just so this isnt forgotten: doesnt work in 2.7 either

[LazyBoot]

Here's a short clip showing the issue