Nik got back to me with the solution:
Thank you for contacting Nik Software.
Inside Silver Efex Pro 2, click on the"Settings" button in the lower left.
In Settings locate the section "GPU" and expand it, in this section you will see a check box "Enable GPU Processing", uncheck this so the GPU will be disabled, then close the settings window.
Close out of Silver Efex Pro 2 (click Cancel), quit out of any and all host applications (Photoshop,Lightroom, Aperture), and then relaunch Silver Efex Pro 2 to see if this corrects this issue.
Problem solved and within 1 business day no less.