Win 10 - Virtualbox - Missing Vector Brush Preview

Just installed Harmony Essentials 12 – playing with the trial. I’m running on Windows 10 under Virtualbox 5.x and am unable to view the preview vector brushes under ‘Tool Properties’. Here is a preview of the problem I am referring to: http://i.imgur.com/tR4i79B.png

Any suggestions for what I can do to fix this issue?

Thanks!

Do you have to use Virtualbox?

Well the host machine is running Linux but I will consider dual-booting into Windows or installing Windows on another machine if there is no other choice-- but I was hoping not to have to do that.