Bug that crashes Cubase!

Cubase suddenly crashes when inside the channel strip plugin I double click a numeric value to input it directly from my keyboard.
This happens on a Win 8.1 64bit system with Cubase 8.5.15 64bit & latest MR tools/drivers/stuff
I also have the Audio Hardware menù missing bug.
Apart these two problems, the card works perfectly with my mobo’s onboard FW (I’ve an Asus P6T Deluxe v2).