@Riverheadstudios
same here – DOES NOT WORK AT ALL with SilverEfexPro 3 and Viveza 3 (but with the older versions)
Didn’t try before, as I use the Wacom Intuos Pro M in old PS only for masking, painting and dodge&burn
and would like to do so in PL4 (see Contest: Can PL be used to simulate lighting from flash for portrait shots ?! - #30 by Wolfgang), but otherwise prefer keyboard, shortcuts and mouse.
@Egregius
thank you for your research 
[ SEP3 and Viv3 don’t respond at all – not even ‘rings’ / description in the link(s) ]