hey i have the same problem when I use the grand 3 as a standalone program it work fine
bud when I use the grand 3 in Cubase 7.5 and load it as a instrument vst plug in
always Cubase crash a seriously problem has detected take contact Steinberg
I have a amd six core whit 16 gb ram
I have motu pci 424
motu 2408 mk3 soundcard