Navigate to Windows Task Manager and End Process Offline renderer on the system where VBoost is installed.
I have had the same problem, any solutions?
computer 1: GTX1080TI / 32G RAM / i7 7700k / GPU MODE
computer 2: GTX980 / 32G RAM / E5 2690
Render sample : Bay.svpj
Try posting to the Visualize forum to get more visibility.
Use lower dpi and try rendering. also check that offline renderer service is not processing in background before you start rendering.