Hi Jeff, The volume dialog data display option "Update display without pressing Show" only effect volume dialog features. It does not have any effect on the Volume Planes tool. The Volume Planes tool does not allow adjusting the plane number without updating the display. Tom Jeff wrote:

hi Tom,

I have volume planes and precomputed subsamplings going, and the 'update display without pressing Show' no longer works (keep toggling on and off, but it doesn't have an effect)

is there a way for me to 'refresh' the state of buttons like that?

-Jeff